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Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2020 | May 31, 2019 | May 31, 2018
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 7,085,120 | $ 6,892,303 | $ 6,476,632
Gross margin | $ 707,820 | $ 824,395 | $ 852,391 | $ 849,142 | $ 823,565 | $ 755,153 | $ 775,158 | $ 774,712 | 3,233,748 | 3,128,588 | 2,908,523
Selling and administrative expenses |  |  |  |  |  |  |  |  | 2,071,052 | 1,980,644 | 1,916,792
G&K Services, Inc. integration expenses |  |  |  |  |  |  |  |  | 0 | 14,410 | 41,897
Gain on sale of a cost method investment |  |  |  |  |  |  |  |  | 0 | 69,373 | 0
Interest expense, net |  |  |  |  |  |  |  |  | 104,405 | 100,508 | 108,833
Income before income taxes |  |  |  |  |  |  |  |  | 1,058,291 | 1,102,399 | 841,001
Depreciation and amortization |  |  |  |  |  |  |  |  | 379,053 | 360,093 | 279,416
Capital expenditures |  |  |  |  |  |  |  |  | 230,289 | 276,719 | 271,699
Total assets | 7,669,885 |  |  |  | 7,436,662 |  |  |  | 7,669,885 | 7,436,662 | 6,958,214
Operating Segments | Uniform rental and facility services |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,643,494 | 5,552,430 | 5,247,124
Gross margin |  |  |  |  |  |  |  |  | 2,588,349 | 2,524,831 | 2,360,165
Selling and administrative expenses |  |  |  |  |  |  |  |  | 1,583,791 | 1,533,711 | 1,500,644
G&K Services, Inc. integration expenses |  |  |  |  |  |  |  |  |  | 14,410 | 41,897
Gain on sale of a cost method investment |  |  |  |  |  |  |  |  |  | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 1,004,558 | 976,710 | 817,624
Depreciation and amortization |  |  |  |  |  |  |  |  | 317,699 | 301,328 | 236,773
Capital expenditures |  |  |  |  |  |  |  |  | 183,364 | 220,373 | 225,694
Total assets | 6,531,673 |  |  |  | 6,442,461 |  |  |  | 6,531,673 | 6,442,461 | 5,977,314
Operating Segments | First Aid and Safety Services |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 708,569 | 619,470 | 564,706
Gross margin |  |  |  |  |  |  |  |  | 338,661 | 297,074 | 265,785
Selling and administrative expenses |  |  |  |  |  |  |  |  | 231,769 | 206,990 | 190,567
G&K Services, Inc. integration expenses |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of a cost method investment |  |  |  |  |  |  |  |  |  | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 106,892 | 90,084 | 75,218
Depreciation and amortization |  |  |  |  |  |  |  |  | 38,516 | 36,824 | 21,898
Capital expenditures |  |  |  |  |  |  |  |  | 35,678 | 36,783 | 27,932
Total assets | 611,205 |  |  |  | 504,920 |  |  |  | 611,205 | 504,920 | 471,165
Operating Segments | All Other |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 733,057 | 720,403 | 664,802
Gross margin |  |  |  |  |  |  |  |  | 306,738 | 306,683 | 282,573
Selling and administrative expenses |  |  |  |  |  |  |  |  | 255,492 | 239,943 | 225,581
G&K Services, Inc. integration expenses |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of a cost method investment |  |  |  |  |  |  |  |  |  | 0 |
Interest expense, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 51,246 | 66,740 | 56,992
Depreciation and amortization |  |  |  |  |  |  |  |  | 22,838 | 21,941 | 20,745
Capital expenditures |  |  |  |  |  |  |  |  | 11,247 | 19,563 | 18,073
Total assets | 381,605 |  |  |  | 392,636 |  |  |  | 381,605 | 392,636 | 371,011
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. integration expenses |  |  |  |  |  |  |  |  |  | 0 | 0
Gain on sale of a cost method investment |  |  |  |  |  |  |  |  |  | 69,373 |
Interest expense, net |  |  |  |  |  |  |  |  | 104,405 | 100,508 | 108,833
Income before income taxes |  |  |  |  |  |  |  |  | (104,405) | (31,135) | (108,833)
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | $ 145,402 |  |  |  | $ 96,645 |  |  |  | $ 145,402 | $ 96,645 | $ 138,724

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