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, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 21.00% 24.50% 35.00%
Effect of state income taxes, net of federal deduction 2.70% 2.20% 1.40%
Foreign statutory taxes compared to federal statutory rate (0.80%) 1.40% (7.20%)
Share-based compensation (3.10%) (0.60%) (1.20%)
U.S. manufacturing incentive 0.00% (1.30%) (1.80%)
Tax credits 4.90% (2.70%) (2.60%)
Tax basis difference 9.80% (1.50%) 0.00%
Transition tax 0.00% 9.00% 0.00%
U.S. statutory tax rate change on temporary differences 0.00% (38.70%) 0.00%
Goodwill write-down (40.20%) 0.00% 0.00%
Other 3.60% (1.60%) (0.40%)
Effective tax rate (2.10%) (9.30%) 23.20%