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Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits, beginning balance | $ 5.7 | $ 7.5 | $ 9.0
Additions for tax positions of prior years | 0.1 |  |
Reductions for tax positions of prior years | (2.8) | (1.7) | (1.8)
Foreign currency translation |  |  | 0.3
Foreign currency translation | (0.1) | (0.1) |
Unrecognized tax benefits, ending balance | $ 2.9 | $ 5.7 | $ 7.5

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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 https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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