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Stock repurchase program - Additional Information (Detail) - shares	Oct. 31, 2015	Apr. 30, 2014
Stock Repurchase Program [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	22,828
Board Of Directors
Stock Repurchase Program [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		500,000

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- Definition

Stock repurchase program.

+ References

No definition available.

+ Details

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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X

- Details

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