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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, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Disclosure Summary Of Components Of Special Charges [Abstract]
Litigation costs	$ 4,231	$ 3,231	$ 8,189	$ 5,171
Employee severance and related costs	575	631	1,700	2,710
Other costs	302	(3)	1,145	1
Special charges	$ 5,108	$ 3,859	$ 11,034	$ 7,882

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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