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Summary of the Components of the Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Disclosure Summary Of Components Of Special Charges [Abstract]
Litigation costs	$ 7,004	$ 3,046	$ 15,193	$ 8,217
Employee severance and related costs	1,377	1,133	3,077	3,843
Other costs	(6)	509	1,139	510
Special charges	$ 8,375	$ 4,688	$ 19,409	$ 12,570

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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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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