INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 12,366	$ 12,649	$ 32,783	$ 21,022
Income before taxes	29,073	34,480	96,102	54,360
Restructuring charges	4,082	1,633	22,444	11,171
Restructuring charges, net of tax	3,129	1,224	17,080	8,377
Other tax expense (benefit) that affect comparability	$ 2,979	1,828	$ 2,864	1,248
Effective income tax rate reconciliation, debt extinguishment loss		1,235		7,925
Effective income tax rate reconciliation, debt extinguishment loss, net of tax		$ 969		$ 6,214
Effective tax rate	31.20%	30.80%	31.10%	32.60%
Effective income tax rate reconciliation, disposition of business			$ (5,291)
Effective income tax rate reconciliation, disposition of business, net of tax			$ (5,251)
Effective income tax rate reconciliation, acquisition cost				$ 2,960
Effective income tax rate reconciliation, acquisition cost, net of tax				$ 2,321