CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 31,530	$ 38,549
Other comprehensive income, net of tax:
Foreign currency translation adjustment	21,625	15,851
Net unrealized (loss) gain on cash flow hedges	(2,386)	4,259
Other comprehensive income, net of tax	19,239	20,110
Comprehensive income	$ 50,769	$ 58,659