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Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Operating Leased Assets [Line Items] |  |  |
Operating lease expense | $ 25.7 | $ 24.2 | $ 24.8
Capital lease amortization expense | 0.8 | 0.2 | $ 0.8
Open standby letters of credit | $ 5.3 | $ 5.3 |
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Capital lease period | 1 year |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Capital lease period | 10 years |  |

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- Definition Lessee Leasing Arrangements, Capital Leases, Term of Contract + References No definition available. + Details
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- Definition The charge for the use of long-lived depreciable capital leased assets for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 840 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501752&loc=d3e56872-110439 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45031-112735 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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