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Segment Information - Information Related to Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2017
Segment Reporting Information |  |  |  |  |
Revenue | $ 1,589,138 | $ 1,255,367 | $ 4,807,082 | $ 3,793,094 |
Income (loss) before income taxes | 174,507 | 178,306 | 599,959 | 555,356 |
Total assets | 6,928,593 | 4,271,164 | 6,928,593 | 4,271,164 | $ 6,844,057
Operating Segments | Uniform Rental and Facility Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 1,284,516 | 988,178 | 3,904,338 | 2,982,475 |
Income (loss) before income taxes | 173,287 | 171,933 | 596,011 | 533,668 |
Total assets | 5,900,987 | 3,283,382 | 5,900,987 | 3,283,382 |
Operating Segments | First Aid and Safety Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 137,327 | 124,239 | 416,999 | 373,875 |
Income (loss) before income taxes | 16,705 | 12,235 | 54,091 | 38,525 |
Total assets | 472,982 | 452,397 | 472,982 | 452,397 |
Operating Segments | All Other |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 167,295 | 142,950 | 485,745 | 436,744 |
Income (loss) before income taxes | 10,032 | 7,823 | 34,232 | 24,191 |
Total assets | 368,368 | 348,703 | 368,368 | 348,703 |
Corporate |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | (25,517) | (13,685) | (84,375) | (41,028) |
Total assets | $ 186,256 | $ 186,682 | $ 186,256 | $ 186,682 |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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