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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Nov. 30, 2017 | Nov. 30, 2016
Fair Value Disclosures [Abstract] |  |
Settlements of contingent consideration obligations | $ 3.3 | $ 4.1

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- References No definition available. + Details
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- Definition Cash outflow representing an adjustment to the purchase price of a previous acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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