ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Sep. 30, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of the components of accumulated other comprehensive income (loss)

The table below summarizes the components of Accumulated other comprehensive income (loss), net of income tax expense (benefit).

	Year Ended September 30,
	2020		2019		2018
Beginning Balance	$	(23,238)	$	4,539	$	3,949
Foreign currency translation adjustment	19,642		(7,957)		(1,730)
Income tax expense (benefit)	(356)		(591)		2,409
Foreign currency translation adjustment, net of tax	19,286		(8,548)		679
Pension and other postretirement	891		(479)		(25)
Income tax expense (benefit)	156		30		(1)
Pension and other postretirement, net of tax	1,047		(449)		(26)
Unrealized gain (loss) on cash flow hedges:
Change in fair value	(23,161)		(23,667)		430
Reclassification adjustment into earnings	9,360		(524)		(515)
Income tax expense	3,090		5,411		22
Unrealized loss on cash flow hedges, net of tax	(10,711)		(18,780)		(63)
Effect of the adoption of the stranded tax effect accounting standard	(497)		—		—
Income tax expense	9		—		—
Effect of the adoption of the stranded tax effect accounting standard, net of tax	(488)		—		—
Net Change	9,134		(27,777)		590
Ending Balance	$	(14,104)	$	(23,238)	$	4,539