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Segment Information - Information Related to Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 29, 2016 | Feb. 28, 2015 | Feb. 29, 2016 | Feb. 28, 2015 | May. 31, 2015
Segment Reporting Information |  |  |  |  |
Revenue | $ 1,216,083 | $ 1,108,847 | $ 3,634,053 | $ 3,334,303 |
Income (loss) before income taxes | 177,124 | 157,459 | 530,627 | 491,829 |
Total assets | 4,231,210 | 4,266,346 | 4,231,210 | 4,266,346 | $ 4,192,460
Operating Segments | Uniform Rental and Facility Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 936,565 | 883,401 | 2,812,677 | 2,648,574 |
Income (loss) before income taxes | 167,502 | 152,165 | 502,178 | 456,548 |
Total assets | 3,050,138 | 2,908,813 | 3,050,138 | 2,908,813 |
Operating Segments | First Aid and Safety Services |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 119,064 | 79,471 | 338,990 | 241,666 |
Income (loss) before income taxes | 12,634 | 11,298 | 36,073 | 32,222 |
Total assets | 436,390 | 264,357 | 436,390 | 264,357 |
Operating Segments | All Other |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 160,454 | 145,975 | 482,386 | 444,063 |
Income (loss) before income taxes | 12,816 | 10,154 | 40,557 | 29,918 |
Total assets | 357,863 | 340,705 | 357,863 | 340,705 |
Corporate |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue | 0 | 0 | 0 | 0 |
Income (loss) before income taxes | (15,828) | (16,158) | (48,181) | (26,859) |
Total assets | $ 386,819 | $ 752,471 | $ 386,819 | $ 752,471 |

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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