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Significant Accounting Policies - Impact of Adoption of ASU 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
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May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017 | Jun. 01, 2018 | May 31, 2016
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 910,120 |  |  |  | $ 804,583 |  |  |  | $ 910,120 | $ 804,583 |  | $ 818,009 |
Inventories, net | 334,589 |  |  |  | 280,347 |  |  |  | 334,589 | 280,347 |  | 269,082 |
Income taxes, current | 7,475 |  |  |  | 19,634 |  |  |  | 7,475 | 19,634 |  |  |
Prepaid expenses and other current assets | 103,318 |  |  |  | 32,383 |  |  |  | 103,318 | 32,383 |  | 95,846 |
Total current assets | 2,236,280 |  |  |  | 1,977,932 |  |  |  | 2,236,280 | 1,977,932 |  | 2,043,556 |
Other assets, net | 240,315 |  |  |  | 29,315 |  |  |  | 240,315 | 29,315 |  | 216,818 |
Total assets | 7,436,662 |  |  |  | 6,958,214 |  |  |  | 7,436,662 | 6,958,214 | $ 6,844,057 | 7,211,341 |
Liabilities and Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 438,179 |  |  |  | 352,581 |  |  |  | 438,179 | 352,581 |  | 416,516 |
Total long-term liabilities | 3,306,208 |  |  |  | 3,165,831 |  |  |  | 3,306,208 | 3,165,831 |  | 3,229,766 |
Retained earnings | 6,691,236 |  |  |  | 5,837,827 |  |  |  | 6,691,236 | 5,837,827 |  | 6,027,019 |
Total shareholders' equity | 3,002,721 |  |  |  | 3,016,526 |  |  |  | 3,002,721 | 3,016,526 | 2,302,793 | 3,205,718 | $ 1,842,659
Total liabilities and shareholders' equity | 7,436,662 |  |  |  | 6,958,214 |  |  |  | 7,436,662 | 6,958,214 |  | 7,211,341 |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,892,303 | 6,476,632 | 5,323,381 |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,980,644 | 1,916,792 | 1,527,380 |  |
Operating income |  |  |  |  |  |  |  |  | 1,133,534 | 949,834 | 773,691 |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,102,399 | 841,001 | 687,404 |  |
Income taxes |  |  |  |  |  |  |  |  | 219,764 | 57,069 | 230,118 |  |
Income from continuing operations | 226,171 | $ 200,923 | $ 242,994 | $ 212,547 | $ 189,298 | $ 295,789 | $ 137,737 | $ 161,108 | 882,635 | 783,932 | 457,286 |  |
Net income |  |  |  |  |  |  |  |  | $ 884,981 | $ 842,586 | $ 480,708 |  |
Diluted earnings per share (dollars per share) |  |  |  |  |  |  |  |  | $ 7.99 | $ 7.56 | $ 4.38 |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 894,301 |  |  |  |  |  |  |  | $ 894,301 |  |  |  |
Inventories, net | 346,267 |  |  |  |  |  |  |  | 346,267 |  |  |  |
Income taxes, current | 7,904 |  |  |  |  |  |  |  | 7,904 |  |  |  |
Prepaid expenses and other current assets | 33,759 |  |  |  |  |  |  |  | 33,759 |  |  |  |
Total current assets | 2,163,009 |  |  |  |  |  |  |  | 2,163,009 |  |  |  |
Other assets, net | 38,518 |  |  |  |  |  |  |  | 38,518 |  |  |  |
Total assets | 7,161,594 |  |  |  |  |  |  |  | 7,161,594 |  |  |  |
Liabilities and Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 369,215 |  |  |  |  |  |  |  | 369,215 |  |  |  |
Total long-term liabilities | 3,237,244 |  |  |  |  |  |  |  | 3,237,244 |  |  |  |
Retained earnings | 6,485,132 |  |  |  |  |  |  |  | 6,485,132 |  |  |  |
Total shareholders' equity | 2,796,617 |  |  |  |  |  |  |  | 2,796,617 |  |  |  |
Total liabilities and shareholders' equity | 7,161,594 |  |  |  |  |  |  |  | 7,161,594 |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,895,010 |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and administrative expenses |  |  |  |  |  |  |  |  | 2,006,134 |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 1,111,164 |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,080,029 |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 214,306 |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | 865,723 |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 868,069 |  |  |  |
Diluted earnings per share (dollars per share) |  |  |  |  |  |  |  |  | $ 7.84 |  |  |  |
Uniform rental and facility services |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 5,552,430 | $ 5,247,124 | $ 4,202,490 |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | 3,027,599 | 2,886,959 | 2,307,774 |  |
Uniform rental and facility services | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,557,056 |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,339,873 | 1,229,508 | 1,120,891 |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | 736,116 | $ 681,150 | $ 635,312 |  |
Other | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,337,954 |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | 735,703 |  |  |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 15,819 |  |  |  |  |  |  |  | 15,819 |  |  |  |
Inventories, net | (11,678) |  |  |  |  |  |  |  | (11,678) |  |  |  |
Income taxes, current | (429) |  |  |  |  |  |  |  | (429) |  |  |  |
Prepaid expenses and other current assets | 69,559 |  |  |  |  |  |  |  | 69,559 |  |  |  |
Total current assets | 73,271 |  |  |  |  |  |  |  | 73,271 |  |  |  |
Other assets, net | 201,797 |  |  |  |  |  |  |  | 201,797 |  |  |  |
Total assets | 275,068 |  |  |  |  |  |  |  | 275,068 |  |  |  |
Liabilities and Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 68,964 |  |  |  |  |  |  |  | 68,964 |  |  |  |
Total long-term liabilities | 68,964 |  |  |  |  |  |  |  | 68,964 |  |  |  |
Retained earnings | 206,104 |  |  |  |  |  |  |  | 206,104 |  |  |  |
Total shareholders' equity | 206,104 |  |  |  |  |  |  |  | 206,104 |  |  |  |
Total liabilities and shareholders' equity | $ 275,068 |  |  |  |  |  |  |  | 275,068 |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | (2,707) |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Selling and administrative expenses |  |  |  |  |  |  |  |  | (25,490) |  |  |  |
Operating income |  |  |  |  |  |  |  |  | 22,370 |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 22,370 |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 5,458 |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | 16,912 |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 16,912 |  |  |  |
Diluted earnings per share (dollars per share) |  |  |  |  |  |  |  |  | $ 0.15 |  |  |  |
Accounting Standards Update 2014-09 | Uniform rental and facility services | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ (4,626) |  |  |  |
Accounting Standards Update 2014-09 | Other | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,919 |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | $ 413 |  |  |  |
Accounting Standards Update 2014-09 | Capitalization of Contract Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  | 0 |
Inventories, net |  |  |  |  |  |  |  |  |  |  |  | 0 |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  |  | 63,463 |
Total current assets |  |  |  |  |  |  |  |  |  |  |  | 63,463 |
Other assets, net |  |  |  |  |  |  |  |  |  |  |  | 187,503 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 250,966 |
Liabilities and Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | 63,389 |
Total long-term liabilities |  |  |  |  |  |  |  |  |  |  |  | 63,389 |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 187,577 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 187,577 |
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 250,966 |
Accounting Standards Update 2014-09 | Assets With No Alternative Use |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  | 13,426 |
Inventories, net |  |  |  |  |  |  |  |  |  |  |  | (11,265) |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  |  | 0 |
Total current assets |  |  |  |  |  |  |  |  |  |  |  | 2,161 |
Other assets, net |  |  |  |  |  |  |  |  |  |  |  | 0 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 2,161 |
Liabilities and Shareholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | 546 |
Total long-term liabilities |  |  |  |  |  |  |  |  |  |  |  | 546 |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 1,615 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 1,615 |
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | $ 2,161 |

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