CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net earnings	$ 101,980	$ 81,039	$ 92,136
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	3,172	(6,474)	(2,254)
Pension plan termination	40,600
Amortization of prior service costs and actuarial losses	(3,455)	(6,066)	(2,003)
Net unrealized gain on derivative instruments		94	37
Total other comprehensive (loss) income, net of tax	40,317	(12,446)	(4,220)
Comprehensive income	$ 142,297	$ 68,593	$ 87,916