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Restructuring Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Aug. 31, 2013 Employees	Sep. 30, 2013
Restructuring And Related Activities [Abstract]
Charges for employee termination benefits		$ 2.2
Asset impairments		$ 0.7
Restructured of employees to converse capital include a staff reduction of employees	47

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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