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Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017 | May 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Allowance for doubtful accounts | $ 6,955 | $ 7,707 |
Inventory obsolescence | 8,668 | 16,096 |
Insurance and contingencies | 36,727 | 54,489 |
Stock-based compensation | 53,532 | 73,027 |
Net operating loss and foreign related carry-forwards | 11,910 | 37,814 |
Deferred compensation and other | 31,093 | 25,891 |
Deferred tax assets, gross | 148,885 | 215,024 |
Valuation allowance | (11,302) | (18,088) | $ (17,047)
Deferred tax assets, net | 137,583 | 196,936 |
Deferred tax liabilities: |  |  |
Uniform and other rental items in service | 143,580 | 210,766 |
Property and equipment | 115,712 | 126,872 |
Service contracts and other intangible assets | 183,000 | 290,049 |
Treasury locks | 3,545 | 6,435 |
State taxes and other | 44,327 | 32,142 |
Deferred tax liabilities | 490,164 | 666,264 |
Net deferred tax liability | $ 352,581 | $ 469,328 |

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