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Stock Options and Stock Appreciation Rights Award Activity (Detail) (Stock Appreciation Rights (Sars) [Member])	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Stock Appreciation Rights (Sars) [Member]
Stock Option [Line Items]
Outstanding options and SARS excluded	733,375	733,375	733,375	382,875

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award Options Outstanding and Stock Appreciation Rights Excluded.

+ References

No definition available.

+ Details

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- Details

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