Acquisition of Magellan- Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 24, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016	Mar. 22, 2016	Oct. 01, 2015
Business Acquisition [Line Items]
Proceeds from term loan					$ 59,851
Acquisition consideration payable current		$ 2,383		$ 2,383
Goodwill		54,612		54,612		$ 61,982
Goodwill impairment charge		6,628		6,628
COST OF SALES		18,943	$ 17,756	56,896	51,020
General and administrative		8,474	7,537	24,346	22,306
Magellan [Member]
Business Acquisition [Line Items]
Total consideration paid	$ 67,874
Acquisition consideration payable	2,383
Acquisition consideration payable current		650		650
Goodwill	40,591	33,963		33,963
Acquisition-related costs					1,105
Goodwill impairment charge		6,628		6,628
COST OF SALES		0	154	0	154
General and administrative		$ 675	746	$ 2,062	746
Term loan								$ 60,000
Magellan [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Transaction costs			1,105		1,105
Fair value adjustments to inventory, property, plant and equipment and identifiable intangible assets			(72)		1,149
Increase (decrease) in equity-based awards granted			6		95
Increase (decrease) in interest expense			$ (52)		$ 800
Magellan [Member] | Five - Year Term Loan [Member]
Business Acquisition [Line Items]
Proceeds from term loan	$ 60,000
Term loan							$ 60,000