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Goodwill and Intangible Assets - Components of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Apr. 30, 2013
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 33,005 | $ 28,703
Less accumulated amortization | (18,833) | (17,029)
Intangible assets, net | 14,172 | 11,674
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 17,245 | 17,043
Less accumulated amortization | (15,224) | (14,800)
Intangible assets, net | 2,021 | 2,243
Client Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 15,760 | 11,660
Less accumulated amortization | (3,609) | (2,229)
Intangible assets, net | $ 12,151 | $ 9,431

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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