Government Incentives - Additional Information (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Job	Jan. 30, 2016 USD ($) Job	Jan. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)
Government Incentive Assistance Program [Line Items]
Cost reduction related to award		$ 3,600,000
Deferred tax asset, net of valuation allowance and federal and state income tax effect		34,071,000	$ 28,526,000	$ 22,951,000
Grow New Jersey Assistance Program (Grow NJ)
Government Incentive Assistance Program [Line Items]
Income tax credits granted from state incentive package		$ 40,000,000
Transferrable income tax credit period		10 years
Government incentive assistance program minimum capital investment		$ 20,000,000
Government incentive assistance program maximum award limit		$ 40,000,000
Government incentive assistance program award period		10 years
Project development, eligible amount per new full time job		$ 7,000
Government incentive assistance program annual award limit		$ 4,000,000
Number of certified eligible jobs | Job	600
Capital investment	$ 50,000,000
Award compliance period	5 years
Award Compliance Description		After the end of the ten-year Grow NJ award earnings period there is a five-year compliance period during which the Company must maintain the average of its annual eligible jobs certified during the preceding ten years or a pro-rata amount up to one-tenth of the previously awarded income tax credits would be subject to recapture and repayment to the State of New Jersey annually during the five-year compliance period.
Agreement to sell annual income tax credits awarded, Description		75% or more
Cost reduction related to award		$ 3,600,000
Cost reduction related to award amount recognized in income statement		2,852,000
Offset to cost of goods sold		(1,846,000)
Offset to selling general and administrative expenses		(1,006,000)
Reduction in inventory overhead		748,000
Grow New Jersey Assistance Program (Grow NJ) | Short-term Deferred Income Taxes
Government Incentive Assistance Program [Line Items]
Deferred tax asset, net of valuation allowance and federal and state income tax effect		$ 1,757,000
Grow New Jersey Assistance Program (Grow NJ) | Minimum
Government Incentive Assistance Program [Line Items]
Government incentive assistance program number of eligible jobs | Job		100