Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Consolidated Effective Tax Rate (Details)

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INCOME TAXES - Reconciliation of Federal Statutory Tax Rate to Consolidated Effective Tax Rate (Details)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 21.00% 21.00% 24.50%
Effect of state income taxes, net of federal deduction (1.90%) 2.70% 2.20%
Foreign statutory taxes compared to federal statutory rate 3.40% (0.80%) 1.40%
Share-based compensation (1.40%) (3.10%) (0.60%)
U.S. manufacturing incentive 0.00% 0.00% (1.30%)
Tax credits 1.80% 4.90% (2.70%)
Tax basis difference 0.00% 9.80% (1.50%)
Transition tax 0.00% 0.00% 9.00%
U.S. statutory tax rate change on temporary differences 0.00% 0.00% (38.70%)
Goodwill write-down (9.40%) (40.20%) 0.00%
Tax rate differential on net operating loss carryback (4.20%) 0.00% 0.00%
Other (0.10%) 3.60% (1.60%)
Effective tax rate 17.60% (2.10%) (9.30%)