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v3.7.0.1

Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands | May 31, 2017 | May 31, 2016 | May 31, 2015
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowance for doubtful accounts | $ 7,707 | $ 7,416 |
Inventory obsolescence | 16,096 | 13,702 |
Insurance and contingencies | 54,489 | 42,717 |
Stock-based compensation | 73,027 | 45,720 |
Net operating loss and foreign related carry-forwards | 37,814 | 17,883 |
Treasury locks | 0 | 12,055 |
Other | 25,891 | 8,100 |
Deferred tax assets, gross | 215,024 | 147,593 |
Valuation allowance | (18,088) | (17,047) | $ (14,690)
Deferred tax assets, net | 196,936 | 130,546 |
Deferred tax liabilities: |  |  |
In service inventory | 210,766 | 172,704 |
Property | 126,872 | 93,784 |
Intangibles | 290,049 | 104,585 |
Treasury locks | 6,435 | 0 |
State taxes and other | 32,142 | 18,948 |
Deferred tax liabilities | 666,264 | 390,021 |
Net deferred tax liability | $ 469,328 | $ 259,475 |

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