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Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,669,550 | $ 1,589,138 | $ 1,606,441 | $ 1,611,503 | $ 1,530,287 | $ 1,255,367 | $ 1,271,077 | $ 1,266,650 | $ 6,476,632 | $ 5,323,381 | $ 4,795,772
Gross margin | 752,338 | $ 700,463 | $ 716,369 | $ 739,353 | 678,726 | $ 559,924 | $ 565,218 | $ 576,427 | 2,908,523 | 2,380,295 | 2,101,340
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,916,792 | 1,527,380 | 1,332,399
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  | 41,897 | 79,224 |
Interest expense, net |  |  |  |  |  |  |  |  | 108,833 | 86,287 | 63,626
Income before income taxes |  |  |  |  |  |  |  |  | 841,001 | 687,404 | 705,315
Depreciation and amortization |  |  |  |  |  |  |  |  | 279,416 | 196,595 | 165,279
Capital expenditures |  |  |  |  |  |  |  |  | 271,699 | 273,317 | 275,385
Total assets | 6,958,214 |  |  |  | 6,844,057 |  |  |  | 6,958,214 | 6,844,057 | 4,098,815
Operating Segments | Uniform Rental and Facility Services |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,247,124 | 4,202,490 | 3,759,524
Gross margin |  |  |  |  |  |  |  |  | 2,360,165 | 1,894,716 | 1,666,691
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,500,644 | 1,138,345 | 994,590
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  | 41,897 | 79,224 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 817,624 | 677,147 | 672,101
Depreciation and amortization |  |  |  |  |  |  |  |  | 236,773 | 156,998 | 130,421
Capital expenditures |  |  |  |  |  |  |  |  | 225,694 | 232,832 | 237,871
Total assets | 5,977,314 |  |  |  | 5,801,680 |  |  |  | 5,977,314 | 5,801,680 | 3,104,822
Operating Segments | First Aid and Safety Services |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 564,706 | 508,233 | 461,783
Gross margin |  |  |  |  |  |  |  |  | 265,785 | 230,166 | 197,010
Selling and administrative expenses |  |  |  |  |  |  |  |  | 190,567 | 177,378 | 147,503
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  | 0 | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 75,218 | 52,788 | 49,507
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,898 | 19,962 | 16,021
Capital expenditures |  |  |  |  |  |  |  |  | 27,932 | 26,863 | 22,364
Total assets | 471,165 |  |  |  | 444,717 |  |  |  | 471,165 | 444,717 | 421,697
Operating Segments | All Other |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 664,802 | 612,658 | 574,465
Gross margin |  |  |  |  |  |  |  |  | 282,573 | 255,413 | 237,639
Selling and administrative expenses |  |  |  |  |  |  |  |  | 225,581 | 211,657 | 190,306
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  | 0 | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 56,992 | 43,756 | 47,333
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,745 | 17,905 | 16,879
Capital expenditures |  |  |  |  |  |  |  |  | 18,073 | 12,645 | 14,840
Total assets | 371,011 |  |  |  | 367,562 |  |  |  | 371,011 | 367,562 | 322,474
Corporate |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  | 0 | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 108,833 | 86,287 | 63,626
Income before income taxes |  |  |  |  |  |  |  |  | (108,833) | (86,287) | (63,626)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 1,730 | 1,958
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 977 | 310
Total assets | $ 138,724 |  |  |  | $ 230,098 |  |  |  | $ 138,724 | $ 230,098 | $ 249,822

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