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Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2013 | Nov. 30, 2012 | Nov. 30, 2013 | Nov. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Amortization of interest rate locks | $ (783) |  |  |  | $ (1,565) |  |  |
Tax benefit | 295 |  | 300 |  | 589 |  | 600 |
Amortization of interest rate locks, net of tax | $ (488) | [1] | $ (488) | [1] | $ (976) | [1] | $ (976) | [1]
[1] | Net of $0.3 million of tax benefit for the three months ended November 30, 2013 and 2012. Net of $0.6 million of tax benefit for the six months ended November 30, 2013 and 2012.

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