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Basis of Presentation - Schedule of Impact of Adopting New Revenue Guidance Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | $ 1,718,268 | $ 1,606,441 | $ 3,416,243 | $ 3,217,944
Selling and administrative expenses | 491,671 | 468,084 | 996,305 | 954,367
Operating income | 275,640 | 235,211 | 540,868 | 484,310
Income (loss) before income taxes | 320,524 | 206,373 | 561,944 | 425,452
Income taxes | 77,530 | 68,636 | 106,403 | 126,607
Income from continuing operations | 242,994 | 137,737 | 455,541 | 298,845
Net income | $ 243,013 | $ 137,109 | $ 455,528 | $ 354,320
Diluted earnings per share (in dollars per share) | $ 2.18 | $ 1.23 | $ 4.07 | $ 3.19
Under Historical Guidance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | $ 3,417,686 |
Selling and administrative expenses |  |  | 1,010,394 |
Operating income |  |  | 529,121 |
Income (loss) before income taxes |  |  | 550,197 |
Income taxes |  |  | 103,537 |
Income from continuing operations |  |  | 446,660 |
Net income |  |  | $ 446,647 |
Diluted earnings per share (in dollars per share) |  |  | $ 3.99 |
Impact of Adopting ASU 2014-09 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | $ (1,443) |
Selling and administrative expenses |  |  | (14,089) |
Operating income |  |  | 11,747 |
Income (loss) before income taxes |  |  | 11,747 |
Income taxes |  |  | 2,866 |
Income from continuing operations |  |  | 8,881 |
Net income |  |  | $ 8,881 |
Diluted earnings per share (in dollars per share) |  |  | $ 0.08 |
Uniform Rental and Facility Services |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | $ 1,390,778 | $ 1,308,038 | $ 2,765,716 | $ 2,619,822
Cost of revenue | 761,119 | 723,960 | 1,507,572 | 1,430,823
Uniform Rental and Facility Services | Under Historical Guidance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | 2,767,884 |
Uniform Rental and Facility Services | Impact of Adopting ASU 2014-09 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | (2,168) |
Other |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue | 327,490 | 298,403 | 650,527 | 598,122
Cost of revenue | $ 181,991 | $ 166,112 | 358,801 | $ 331,399
Other | Under Historical Guidance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | 649,802 |
Cost of revenue |  |  | 357,902 |
Other | Impact of Adopting ASU 2014-09 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total revenue |  |  | 725 |
Cost of revenue |  |  | $ 899 |

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