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Operating Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | [1] | Nov. 30, 2015 | [1] | Aug. 31, 2015 | [1] | May 31, 2017 | May 31, 2016 | May 31, 2015
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 1,530,287 | $ 1,255,367 | $ 1,271,077 | $ 1,266,650 | $ 1,243,548 | [1] | $ 1,190,539 | $ 1,191,121 | $ 1,170,564 | $ 5,323,381 | $ 4,795,772 | $ 4,369,677
Gross margin |  | 678,726 | $ 559,924 | $ 565,218 | $ 576,427 | 546,371 | [1] | $ 517,853 | $ 520,221 | $ 516,895 | 2,380,295 | 2,101,340 | 1,892,923
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  | 1,527,380 | 1,332,399 | 1,209,284
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  |  |  | 79,224 |  |
Gain on sale of stock of an equity method investment |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 21,739
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 86,287 | 63,626 | 64,822
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 687,404 | 705,315 | 640,556
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 196,595 | 165,279 | 152,595
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 273,317 | 275,385 | 217,720
Total assets |  | 6,844,057 |  |  |  | 4,098,815 |  |  |  |  | 6,844,057 | 4,098,815 | 4,185,674
Operating Segments | Uniform Rental and Facility Services |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 4,202,490 | 3,759,524 | 3,519,199
Gross margin |  |  |  |  |  |  |  |  |  |  | 1,894,716 | 1,666,691 | 1,526,534
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  | 1,138,345 | 994,590 | 922,582
G&K Services, Inc. transaction and integration expenses |  |  |  |  |  |  |  |  |  |  | 79,224 |  |
Gain on sale of stock of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 677,147 | 672,101 | 603,952
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 156,998 | 130,421 | 123,129
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 232,832 | 237,871 | 184,200
Total assets |  | 5,801,680 |  |  |  | 3,104,822 |  |  |  |  | 5,801,680 | 3,104,822 | 2,831,978
Operating Segments | First Aid and Safety Services |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 508,233 | 461,783 | 326,593
Gross margin |  |  |  |  |  |  |  |  |  |  | 230,166 | 197,010 | 152,339
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  | 177,378 | 147,503 | 107,226
Gain on sale of stock of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 52,788 | 49,507 | 45,113
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 19,962 | 16,021 | 9,774
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 26,863 | 22,364 | 13,589
Total assets |  | 444,717 |  |  |  | 421,697 |  |  |  |  | 444,717 | 421,697 | 254,707
Operating Segments | All Other |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 612,658 | 574,465 | 523,885
Gross margin |  |  |  |  |  |  |  |  |  |  | 255,413 | 237,639 | 214,050
Selling and administrative expenses |  |  |  |  |  |  |  |  |  |  | 211,657 | 190,306 | 179,476
Gain on sale of stock of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 0
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 43,756 | 47,333 | 34,574
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 17,905 | 16,879 | 16,909
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 12,645 | 14,840 | 18,528
Total assets |  | 367,562 |  |  |  | 322,474 |  |  |  |  | 367,562 | 322,474 | 299,885
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures related to operating segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin | [2] |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling and administrative expenses | [2] |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on sale of stock of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 21,739
Interest expense, net | [2] |  |  |  |  |  |  |  |  |  | 86,287 | 63,626 | 64,822
Income before income taxes | [2] |  |  |  |  |  |  |  |  |  | (86,287) | (63,626) | (43,083)
Depreciation and amortization | [2] |  |  |  |  |  |  |  |  |  | 1,730 | 1,958 | 2,783
Capital expenditures | [2] |  |  |  |  |  |  |  |  |  | 977 | 310 | 1,403
Total assets | [2] | $ 230,098 |  |  |  | $ 249,822 |  |  |  |  | $ 230,098 | $ 249,822 | $ 799,104
[1] | The figures for fiscal 2016 reflect the change in classification of Discontinued Services as discontinued operations within the Consolidated Statements of Income. See Note 16 entitled Discontinued Operations for additional information.
[2] | Corporate assets include cash and marketable securities in all periods presented. Corporate assets as of May 31, 2017 and 2016 also include the assets of Discontinued Services. Corporate assets as of May 31, 2015 also include assets of Discontinued Services, Shred-it and real estate assets of Storage that were not included in the sale transactions. Corporate depreciation and amortization includes depreciation and amortization of Discontinued Services.

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