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Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Inventory Disclosure [Abstract]
Inventories market valuation allowance	$ 3.0	$ 1.8

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Amount of valuation reserve for inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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