Inventories (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014
Inventory Disclosure [Abstract]
Finished goods inventory that has been shipped, but for which all revenue recognition criteria has not been met	$ 0.1	$ 0.4
Reservce for obsolescence	$ 4.0	$ 5.0

Amount of valuation reserve for inventory.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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