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Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits, beginning balance | $ 8.1 | $ 14.1 | $ 13.2
Additions based on tax positions related to current year |  | 0.1 | 5.1
Additions for tax positions of prior years | 2.0 | 2.0 |
Reductions for tax positions of prior years | (0.9) | (7.9) | (4.5)
Foreign currency translation | (0.2) | (0.2) |
Foreign currency translation |  |  | 0.3
Unrecognized tax benefits, ending balance | $ 9.0 | $ 8.1 | $ 14.1

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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