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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Aug. 31, 2015 | May. 31, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 115,697 | $ 36,225
Accumulated Amortization | (17,961) | (15,957)
Net Carrying Amount | 97,736 | 20,268
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 99,164 | 22,612
Accumulated Amortization | (10,636) | (9,111)
Net Carrying Amount | 88,528 | 13,501
Non-compete agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,036 | 3,417
Accumulated Amortization | (3,380) | (3,363)
Net Carrying Amount | 1,656 | 54
Trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,702 | 4,401
Accumulated Amortization | (1,387) | (1,074)
Net Carrying Amount | 4,315 | 3,327
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,112 | 5,112
Accumulated Amortization | (2,363) | (2,230)
Net Carrying Amount | 2,749 | 2,882
Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 683 | 683
Accumulated Amortization | (195) | (179)
Net Carrying Amount | $ 488 | $ 504

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