UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 19,939	$ 18,702	$ 60,450	$ 39,142
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(2,635)	3,795	(6,326)	10,152
Minimum pension liability adjustment	0	0	0	287
Net unrealized gain (loss) on cash flow hedges	1	(173)	819	(265)
Other comprehensive income (loss), net of tax	(2,634)	3,622	(5,507)	10,174
Comprehensive income	$ 17,305	$ 22,324	$ 54,943	$ 49,316