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Summary of the Components of the Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2012	Apr. 30, 2012	Jul. 31, 2013	Jul. 31, 2012
Disclosure Summary Of Components Of Special Charges [Abstract]
Employee severance and related costs	$ 631		$ 1,029		$ 2,710	$ 2,017
Other charges litigation	3,231		1,236		5,171	1,777
Other costs	(3)		478		1	637
Special charges	$ 3,859	$ 4,023	$ 2,743	$ 1,688	$ 7,882	$ 4,431

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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