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Income Taxes (Components of Deferred Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 5,322 | $ 5,577
Inventory obsolescence | 12,220 | 11,507
Insurance and contingencies | 33,984 | 28,708
Stock-based compensation | 17,513 | 16,017
Foreign tax credit carry-forward | 5,397 | 9,054
Treasury locks | 8,020 | 9,032
Other | 20,030 | 9,421
Deferred tax assets, gross | 102,486 | 89,316
Valuation allowance | (12,789) | (9,054)
Deferred tax assets, net | 89,697 | 80,262
Deferred tax liabilities: |  |
In service inventory | 131,334 | 64,061
Property | 123,904 | 122,675
Intangibles | 99,267 | 88,696
State taxes and other | 22,844 | 11,970
Deferred tax liabilities | 377,349 | 287,402
Net deferred tax liability | $ 287,652 | $ 207,140

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