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Commitments and Contingencies - Contingencies (Details) (Necessary Maintenance And Repairs [Member], USD $) In Millions, unless otherwise specified | Aug. 31, 2013 | Jun. 01, 2013
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Loss Contingencies [Line Items] |  |
Loss Contingency, Range of Possible Loss, Minimum | $ 0 |
Loss Contingency, Range of Possible Loss, Maximum | 3.0 |
Other Accrued Liabilities [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual, at Carrying Value | $ 1.3 | $ 1.3

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