Operating Segment Information Cintas reportable operating segments are Uniform Rental and Facility Services and First Aid and Safety Services. The Uniform Rental and Facility Services reportable operating segment, consists of the rental and servicing of uniforms and other garments including flame resistant clothing, mats, mops and shop towels and other ancillary items. In addition to these rental items, restroom cleaning services and supplies, carpet and tile cleaning services and the sale of items from our catalogs to our customers on route are included within this reportable operating segment. The First Aid and Safety Services reportable operating segment consists of first aid and safety products and services. The remainder of Cintas business, which consists of Fire Protection Services and its Uniform Direct Sale business, is included in All Other. Cintas evaluates the performance of each operating segment based on several factors of which the primary financial measures are operating segment revenue and income before income taxes. The accounting policies of the operating segments are the same as those described in Note 1 entitled Significant Accounting Policies. Information related to the operations of Cintas' operating segments is set forth below: (In thousands) Uniform Rental and Facility Services First Aid and Safety Services All Other Corporate (1) Total May 31, 2019 Revenue $ 5,552,430 $ 619,470 $ 720,403 $  $ 6,892,303 Gross margin $ 2,524,831 $ 297,074 $ 306,683 $  $ 3,128,588 Selling and administrative expenses 1,533,711 206,990 239,943  1,980,644 G&amp;K Services, Inc. integration expenses 14,410    14,410 Gain on sale of a cost method investment    69,373 69,373 Interest expense, net    100,508 100,508 Income before income taxes $ 976,710 $ 90,084 $ 66,740 $ (31,135 ) $ 1,102,399 Depreciation and amortization $ 301,328 $ 36,824 $ 21,941 $  $ 360,093 Capital expenditures $ 220,373 $ 36,783 $ 19,563 $  $ 276,719 Total assets $ 6,442,461 $ 504,920 $ 392,636 $ 96,645 $ 7,436,662 May 31, 2018 Revenue $ 5,247,124 $ 564,706 $ 664,802 $  $ 6,476,632 Gross margin $ 2,360,165 $ 265,785 $ 282,573 $  $ 2,908,523 Selling and administrative expenses 1,500,644 190,567 225,581  1,916,792 G&amp;K Services, Inc. transaction and integration expenses 41,897    41,897 Interest expense, net    $ 108,833 108,833 Income before income taxes $ 817,624 $ 75,218 $ 56,992 $ (108,833 ) $ 841,001 Depreciation and amortization $ 236,773 $ 21,898 $ 20,745 $  $ 279,416 Capital expenditures $ 225,694 $ 27,932 $ 18,073 $  $ 271,699 Total assets $ 5,977,314 $ 471,165 $ 371,011 $ 138,724 $ 6,958,214 May 31, 2017 Revenue $ 4,202,490 $ 508,233 $ 612,658 $  $ 5,323,381 Gross margin $ 1,894,716 $ 230,166 $ 255,413 $  $ 2,380,295 Selling and administrative expenses 1,138,345 177,378 211,657  1,527,380 G&amp;K Services, Inc. transaction and integration expenses 79,224    79,224 Interest expense, net    86,287 86,287 Income before income taxes $ 677,147 $ 52,788 $ 43,756 $ (86,287 ) $ 687,404 Depreciation and amortization $ 156,998 $ 19,962 $ 17,905 $ 1,730 $ 196,595 Capital expenditures $ 232,832 $ 26,863 $ 12,645 $ 977 $ 273,317 Total assets $ 5,801,680 $ 444,717 $ 367,562 $ 230,098 $ 6,844,057 (1) Corporate assets include cash and marketable securities in all periods presented. Corporate assets as of May 31, 2017 also include the assets of Discontinued Services. Corporate depreciation, amortization and capital expenditures includes depreciation and amortization of Discontinued Services.