CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 34,571	$ (149,808)	$ 61,999	$ (118,278)
Other comprehensive income:
Foreign currency translation adjustment	(11,112)	(13,763)	(13,741)	7,780
Income tax (expense) benefit	(305)	(52)	(268)	30
Total foreign currency translation adjustment, net of tax	(11,417)	(13,815)	(14,009)	7,810
Unrealized gain on cash flow hedges:
Change in fair value	26,508	19,361	31,979	12,912
Reclassification adjustment into earnings	3,578	3,595	7,155	6,969
Income tax expense	(6,869)	(5,140)	(8,935)	(4,451)
Total unrealized gain on cash flow hedges, net of tax	23,217	17,816	30,199	15,430
Other comprehensive income, net of tax	11,800	4,001	16,190	23,240
Comprehensive income (loss)	$ 46,371	$ (145,807)	$ 78,189	$ (95,038)