Quarterly report pursuant to Section 13 or 15(d)

Debt, Interest Rate Swaps (Details)

v3.4.0.3
Debt, Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Interest rate cash flow hedges [Abstract]    
Unrealized gain (loss) on fair value of interest rate swaps, before tax $ (5,746) $ (3,686)
Unrealized gain (loss) on fair value of interest rate swaps, after tax (3,505) $ (2,248)
Unrealized gain (loss) expected to be recognized over the next 12 months $ (878)  
Interest Rate Swap 1 [Member]    
Derivative [Line Items]    
Effective Date June 2012  
Amount $ 40,000  
Fixed Interest Rate 1.88%  
Interest Rate Spread 1.75%  
Maturity Date June 2022  
Interest Rate Swap 2 [Member]    
Derivative [Line Items]    
Effective Date August 2012  
Amount $ 35,000  
Fixed Interest Rate 1.74%  
Interest Rate Spread 1.75%  
Maturity Date June 2022  
Interest Rate Swap 3 [Member]    
Derivative [Line Items]    
Effective Date September 2012  
Amount $ 25,000  
Fixed Interest Rate 1.24%  
Interest Rate Spread 1.75%  
Maturity Date March 2017  
Interest Rate Swap 4 [Member]    
Derivative [Line Items]    
Effective Date May 2014  
Amount $ 25,000  
Fixed Interest Rate 1.35%  
Interest Rate Spread 1.75%  
Maturity Date May 2018  
Interest Rate Swap 5 [Member]    
Derivative [Line Items]    
Effective Date November 2014  
Amount $ 25,000  
Fixed Interest Rate 1.26%  
Interest Rate Spread 1.75%  
Maturity Date June 2018  
Interest Rate Swap 6 [Member]    
Derivative [Line Items]    
Effective Date March 2015  
Amount $ 25,000  
Fixed Interest Rate 1.49%  
Interest Rate Spread 1.75%  
Maturity Date March 2019  
Interest Rate Swap 7 [Member]    
Derivative [Line Items]    
Effective Date September 2015  
Amount $ 25,000  
Fixed Interest Rate 1.39%  
Interest Rate Spread 1.75%  
Maturity Date September 2020  
Interest Rate Swap 8 [Member]    
Derivative [Line Items]    
Effective Date November 2015  
Amount $ 25,000  
Fixed Interest Rate 1.32%  
Interest Rate Spread 1.75%  
Maturity Date November 2020  
Interest Rate Swap 9 [Member]    
Derivative [Line Items]    
Effective Date December 2015  
Amount $ 25,000  
Fixed Interest Rate 1.59%  
Interest Rate Spread 1.75%  
Maturity Date December 2020  
Interest Rate Swap 10 [Member]    
Derivative [Line Items]    
Effective Date February 2016  
Amount $ 25,000  
Fixed Interest Rate 0.99%  
Interest Rate Spread 1.75%  
Maturity Date February 2020  
Interest Rate Swap 11 [Member]    
Derivative [Line Items]    
Effective Date February 2016  
Amount $ 25,000  
Fixed Interest Rate 1.03%  
Interest Rate Spread 1.75%  
Maturity Date February 2022