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Goodwill And Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Amortization expense | $ 8.2 | $ 8.7 | $ 5.0
Amortizable intangible assets fully amortization year | 2031 |  |
Trademarks |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangible assets acquired | $ 0.3 |  |
Weighted-Average Amortization Period (in years) | 1 year |  |
Customer Lists |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangible assets acquired | $ 6.2 |  |
Weighted-Average Amortization Period (in years) | 10 years |  |
Non-compete Agreements |  |  |
Schedule Of Goodwill And Intangible Assets [Line Items] |  |  |
Intangible assets acquired | $ 0.1 |  |
Weighted-Average Amortization Period (in years) | 5 years |  |

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- Definition Schedule Of Goodwill And Intangible Assets [Line Items] + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- 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
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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