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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Restructuring And Related Activities [Abstract]
Restructuring charges	$ 0	$ 0	$ 0	$ 0
Percentage of eliminated work force					6.00%
Pre-Tax Restructuring Charges					$ 0.5

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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