Acquisition of Magellan - Schedule of Business Combination Financial Results Included in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
NET REVENUES	$ 50,665	$ 48,204	$ 149,084	$ 147,762
Net earnings	8,754	$ 9,102	26,738	$ 27,073
Magellan [Member]
Business Acquisition [Line Items]
NET REVENUES	4,752		4,752
Net earnings	$ 231		$ 231