CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Net earnings	$ 9,994	$ 11,157	$ 44,665	$ 21,884
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2,837	2,548	4,125	(1,815)
Net unrealized gain (loss) on derivative instruments	138	29	155	(103)
Total other comprehensive income (loss), net of tax	2,975	2,577	4,280	(1,918)
Comprehensive income	$ 12,969	$ 13,734	$ 48,945	$ 19,966