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Organizational Realignment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013
Restructuring and Related Activity [Line Items]
Severance and termination-related expenses	$ 7.1us-gaap_SeveranceCosts1
Unrecorded stock compensation expenses	1.1
Selling, General and Administrative Expenses [Member]
Restructuring and Related Activity [Line Items]
Severance and termination-related expenses	$ 7.1

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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