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Stock repurchase program - Additional Information (Detail) - shares | Oct. 31, 2015 | Apr. 30, 2014
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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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Balance Type: | na
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |