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Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016 | Feb. 28, 2017
Operating Leased Assets [Line Items] |  |  |  |
Operating lease expense | $ 26.0 | $ 24.9 | $ 25.7 |
Capital lease amortization expense | 1.3 | 1.1 | $ 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 |  |  |
State Sales Tax Assessment [Member] | Wisconsin [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Sales and Excise Tax Payable |  |  |  | $ 5.4

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