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Long-Term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument [Line Items]
Long-term debt		$ 15,257
Current portion of long-term debt		(15,257)
Long-term Debt, Total
Outstanding borrowings under Senior secured term loan B
Debt Instrument [Line Items]
Long-term debt		13,427
Outstanding borrowings under Industrial revenue bond
Debt Instrument [Line Items]
Long-term debt		1,830
Current portion of long-term debt		$ (1,830)

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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