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Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2016 | Nov. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on Storage transactions |  |  | $ 0 | $ 15,786
Gain on Shred-it |  |  | 25,876 | 349,738
Net income from discontinued operations | $ 16,923 | $ 229,647 | 16,923 | 223,630
Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Income before income taxes | 0 | 845 | 0 | 1,082
Gain on Storage transactions | 0 | 10,943 | 0 | 15,786
Gain on Shred-it | 25,876 | 364,254 | 25,876 | 349,738
Income tax expense on net gain | (8,953) | (146,395) | (8,953) | (142,976)
Net income from discontinued operations | $ 16,923 | $ 229,647 | $ 16,923 | $ 223,630

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