Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Accounting Policies [Line Items]
Cost of goods sold	$ 23,750	$ 23,977	$ 61,742	$ 68,118
Selling, general and administrative expenses	5,863	3,927	14,793	10,512
Interest Rate Swap
Accounting Policies [Line Items]
Interest rate swap agreement amount					$ 4,000
Previously reported
Accounting Policies [Line Items]
Cost of goods sold	23,842		67,665
Selling, general and administrative expenses		4,062		10,965
Actual
Accounting Policies [Line Items]
Cost of goods sold	23,977		68,118
Selling, general and administrative expenses		$ 3,927		$ 10,512
Change in Third Party Actuary | Adjustment
Accounting Policies [Line Items]
Decrease in workers compensation expense			400
Change in workers compensation reserve	$ 400		$ 400