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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Feb. 28, 2015 | Feb. 28, 2015
Income Tax Disclosure [Abstract] |  |
Unrecognized tax benefits, period increase (decrease) | $ 0.4 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease | $ 1.4 us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Unrecognized tax benefits, increase in accrued interest (less than $0.1 million for the three months ended February 28, 2015) | $ 0.1 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | $ 0.2 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense

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- Details
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- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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