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Goodwill and Intangible Assets - Components of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Oct. 31, 2014 | Apr. 30, 2014
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 33,371 | $ 33,005
Less accumulated amortization | (21,059) | (19,585)
Intangible assets, net | 12,312 | 13,420
Covenants Not-to-Compete [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 17,296 | 17,245
Less accumulated amortization | (15,638) | (15,363)
Intangible assets, net | 1,658 | 1,882
Client Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 16,075 | 15,760
Less accumulated amortization | (5,421) | (4,222)
Intangible assets, net | $ 10,654 | $ 11,538

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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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