Inventories (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 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	$ 0.1us-gaap_OtherInventoryCapitalizedCosts	$ 0.4us-gaap_OtherInventoryCapitalizedCosts
Reservce for obsolescence	$ 5us-gaap_InventoryValuationReserves	$ 5us-gaap_InventoryValuationReserves

Amount of valuation reserve for inventory.

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

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Name:	us-gaap_InventoryValuationReserves
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant