PENSION AND OTHER POSTRETIREMENT PLANS (Details)

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PENSION AND OTHER POSTRETIREMENT PLANS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended																																																	12 Months Ended				12 Months Ended
	Sep. 30, 2012 Principal Retirement Plan [Member]	Sep. 30, 2012 Supplemental Retirement Plan [Member]	Sep. 30, 2012 Pension Plans [Member]	Sep. 30, 2011 Pension Plans [Member]	Sep. 30, 2010 Pension Plans [Member]	Sep. 30, 2012 Pension Plans [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Level 3 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Stocks [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Stocks [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Stocks [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Stocks [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Stocks [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Stocks [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Stocks [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Stocks [Member] Level 3 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Mutual Funds [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Mutual Funds [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Equity Securities - Mutual Funds [Member] Level 3 [Member]	Sep. 30, 2012 Pension Plans [Member] Fixed Income Securities [Member]	Sep. 30, 2011 Pension Plans [Member] Fixed Income Securities [Member]	Sep. 30, 2012 Pension Plans [Member] Fixed Income Securities [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Fixed Income Securities [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Fixed Income Securities [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Fixed Income Securities [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Fixed Income Securities [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Fixed Income Securities [Member] Level 3 [Member]	Sep. 30, 2012 Pension Plans [Member] Cash and Cash Equivalents [Member]	Sep. 30, 2011 Pension Plans [Member] Cash and Cash Equivalents [Member]	Sep. 30, 2012 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Cash and Cash Equivalents [Member] Level 3 [Member]	Sep. 30, 2012 Pension Plans [Member] Other Plan Investments [Member]	Sep. 30, 2011 Pension Plans [Member] Other Plan Investments [Member]	Sep. 30, 2012 Pension Plans [Member] Other Plan Investments [Member] Level 1 [Member]	Sep. 30, 2011 Pension Plans [Member] Other Plan Investments [Member] Level 1 [Member]	Sep. 30, 2012 Pension Plans [Member] Other Plan Investments [Member] Level 2 [Member]	Sep. 30, 2011 Pension Plans [Member] Other Plan Investments [Member] Level 2 [Member]	Sep. 30, 2012 Pension Plans [Member] Other Plan Investments [Member] Level 3 [Member]	Sep. 30, 2011 Pension Plans [Member] Other Plan Investments [Member] Level 3 [Member]	Dec. 31, 2011 Pension Plans [Member] Other Plan Investments [Member] Level 3 [Member]	Dec. 31, 2010 Pension Plans [Member] Other Plan Investments [Member] Level 3 [Member]	Sep. 30, 2012 Other Postretirement Plans [Member]	Sep. 30, 2011 Other Postretirement Plans [Member]	Sep. 30, 2010 Other Postretirement Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year			$ 168,033	$ 145,909																																																		$ 27,547	$ 24,400
Service cost			5,852	5,016	4,489																																																	730	632	691
Interest cost			7,842	7,510	7,495																																																	1,283	1,254	1,383
Assumption changes			19,701	16,501																																																		2,508	2,285
Actuarial gain			688	(887)																																																		(2,473)	(226)
Benefit payments			(6,256)	(6,016)																																																		(764)	(798)
Benefit obligation, end of year			195,860	168,033																																																		28,831	27,547
Change in plan assets [Roll Forward]
Fair value, beginning of year			100,554	94,869																																																13,375	12,212	0	0
Acquisitions																																																		3,800	0
Dispositions																																																		0	0
Realized Losses																																																		766	(90)
Unrealized Gains																																																		232	1,073
Actual return			16,000	1,300																																																		0	0
Benefit payments			(6,256)	(6,016)																																																		(764)	(798)
Employer contributions			6,279	10,401																																																		764	798
Fair value, end of year			116,577	100,554		85,697	72,758	12,707	14,421	18,173	13,375	34,127	23,954	34,127	23,954	0	0	0	0	29,059	26,193	29,059	26,193	0	0	0	0	23,230	21,618	10,523	7,197	12,707	14,421	0	0	11,988	15,414	11,988	15,414	0	0	0	0	18,173	13,375	0	0	0	0	18,173	13,375			0	0
Funded status			(79,283)	(67,480)																																																		(28,831)	(27,547)
Unrecognized actuarial loss			92,940	85,868																																																		8,561	8,462
Unrecognized prior service cost			(2,142)	(525)																																																		(1,774)	(1,607)
Net amount recognized			11,515	17,863																																																		(22,044)	(20,692)
Amounts recognized in the consolidated balance sheet:
Current liability			(720)	(766)																																																		(1,106)	(1,130)
Noncurrent benefit liability			(78,563)	(66,714)																																																		(27,725)	(26,417)
Accumulated other comprehensive loss			90,798	85,343																																																		6,787	6,855
Net amount recognized			11,515	17,863																																																		(22,044)	(20,692)
Amounts recognized in accumulated other comprehensive loss:
Net actuarial loss			92,940	85,868																																																		8,561	8,462
Prior service cost			(2,142)	(525)																																																		(1,774)	(1,607)
Net amount recognized			90,798	85,343																																																		6,787	6,855
Accumulated benefit obligations in excess of plan assets [Abstract]
Accumulated benefit obligation			172,142	149,846
Projected benefit obligation			195,860	168,033
Net periodic benefit cost [Abstract]
Service cost			5,852	5,016	4,489																																																	730	632	691
Interest cost			7,842	7,510	7,495																																																	1,283	1,254	1,383
Expected return on plan assets			(7,836)	(7,398)	(6,982)																																																	0	0	0
Amortization:
Prior service cost			(45)	26	24																																																	(451)	(476)	(726)
Net actuarial loss			6,814	5,364	5,395																																																	535	407	521
Net benefit cost			12,627	10,518	10,421																																																	2,097	1,817	1,869
Contributions during fiscal 2012:
Pension contributions	5,000	728																																																				0
Other postretirement contributions	0	0																																																				953
Amounts of AOCL expected to be recognized in net periodic benefit costs [Abstract]
Net actuarial loss			7,316																																																			439
Prior service cost			(206)																																																			(272)
Weighted-average assumptions [Abstract]
Discount rate (in hundredths)			4.00%	4.75%	5.25%																																																	4.00%	4.75%	5.25%
Return on plan assets (in hundredths)			8.00%	8.00%	8.00%																																																	0.00%	0.00%	0.00%
Compensation increase (in hundredths)			3.50%	3.50%	3.50%																																																	0.00%	0.00%	0.00%
Weighted average asset allocation [Abstract]
Equity securities			63,186	50,147
Fixed income, cash and cash equivalents			35,218	37,032
Other investments			18,173	13,375
Fair value of plan assets			116,577	100,554		85,697	72,758	12,707	14,421	18,173	13,375	34,127	23,954	34,127	23,954	0	0	0	0	29,059	26,193	29,059	26,193	0	0	0	0	23,230	21,618	10,523	7,197	12,707	14,421	0	0	11,988	15,414	11,988	15,414	0	0	0	0	18,173	13,375	0	0	0	0	18,173	13,375			0	0
Target allocation [Abstract]
Equity securities (in hundredths)			50.00%
Fixed income, cash and cash equivalents (in hundredths)			30.00%
Other investments (in hundredths)			20.00%
Total target asset allocation (in hundredths)			100.00%
Cash included in plan assets (in hundredths)			4.00%	9.00%
Fair value of plan assets [Abstract]
Fair value of plan assets			116,577	100,554		85,697	72,758	12,707	14,421	18,173	13,375	34,127	23,954	34,127	23,954	0	0	0	0	29,059	26,193	29,059	26,193	0	0	0	0	23,230	21,618	10,523	7,197	12,707	14,421	0	0	11,988	15,414	11,988	15,414	0	0	0	0	18,173	13,375	0	0	0	0	18,173	13,375			0	0
Benefit payments expected to be paid [Abstract]
2013			6,307																																																			1,106
2014			6,667																																																			1,203
2015			6,981																																																			1,284
2016			7,402																																																			1,347
2017			7,879																																																			1,478
2018-2022			47,811																																																			9,394
Total benefits expected to be paid			83,047																																																			15,812
Assumed health care cost trend rates [Abstract]
Per capita cost of health care benefits assumed for next fiscal year (in hundredths)																																																						9.00%
Ultimate health care cost trend rate (in hundredths)																																																						5.00%
Year that rate reaches ultimate trend rate																																																						2031
Effect of one-percentage point change in assumed health care cost trend rates [Abstract]
Effect of one percentage point increase on accumulated postretirement benefit obligation																																																						1,447
Effect of one percentage point increase on service and interest cost components																																																						122
Effect of one percentage point decrease on accumulated postretirement benefit obligation																																																						1,283
Effect of one percentage point decrease on service and interest cost components																																																						$ 107