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Interim Basis of Presentation and Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Schedule Of Significant Accounting Policies [Line Items]
Carrying value of floating-rate term loan	$ 56,625
Fair value of floating-rate term loan	56,309
Sales value of Bill and Hold Inventory	11,245	19,346
Interest Rate Swap
Schedule Of Significant Accounting Policies [Line Items]
Fair value of the swap agreement	$ 491

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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