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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2015 | Nov. 30, 2015 | Nov. 30, 2014 | May. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Settlements of contingent consideration obligations |  | $ 1,600 |  |
Reversal for contingent earn out targets | $ 14,500 | 14,500 | $ 18,080 |
Fair Value, Measurements, Recurring | Foreign currency forward contract |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Foreign currency contracts, fair value of liability | $ 8,678 | $ 8,678 |  | $ 6,369

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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