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Severance and Other Restructuring Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Oct. 31, 2013 Employees	Oct. 31, 2013 Employees
Restructuring And Related Activities [Abstract]
Severance and restructuring charges	$ 0.1	$ 0.9
Number of employees	1	20

- 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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