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Severance and Reorganization - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Jan. 31, 2014	Oct. 31, 2013	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Reorganizations [Abstract]
Severance and reorganization charges	$ 0	$ 1,793	$ 1,636	$ 161	$ 3,463

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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