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Contingencies and Other Accrued Losses - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2019
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Increase (decrease) in net income due to restatement effect | $ 18.0 | $ (10.8) | $ (7.2) |
Litigation settlement amount |  |  |  | $ 6.5

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- Definition Resulting effect of restatement to correct an error, after tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 + Details
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