CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net earnings	$ 81,039	$ 92,136	$ 53,703
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(6,474)	(2,254)	6,383
Amortization of prior service costs and actuarial (losses) gains	(6,066)	(2,003)	5,573
Net unrealized gain on derivative instruments	94	37	19
Total other comprehensive (loss) income, net of tax	(12,446)	(4,220)	11,975
Comprehensive income	$ 68,593	$ 87,916	$ 65,678