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Business Combinations - Additional Information (Detail) | 12 Months Ended
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Apr. 30, 2014
Minimum [Member] |
Business Acquisition [Line Items] |
Acquired intangible assets, amortization period | 5 years
Maximum [Member] |
Business Acquisition [Line Items] |
Acquired intangible assets, amortization period | 10 years

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration