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Severance and Other Restructuring Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	1 Months Ended
	Oct. 31, 2014	Oct. 31, 2014	Oct. 31, 2014 CEO [Member]
Restructuring Cost and Reserve [Line Items]
Severance and restructuring charges	$ 1.2	$ 1.9	$ 1.2

- 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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