CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 43,320	$ 26,028
Other comprehensive income, net of tax:
Foreign currency translation adjustments	4,801	13,264
Actuarial gains (losses), net of tax effects of $0 and $5 during the three months ended December 31, 2021 and 2020	(3)	(38)
Total other comprehensive income, net of tax	4,798	13,226
Comprehensive income	$ 48,118	$ 39,254