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Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2017 | May 31, 2016 | May 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income tax expense | $ 1,460 | $ 15,786 | $ 38,573
Gain (loss) on Shred-it | 25,457 | 354,071 | (3,851)
Net income from discontinued operations | 23,422 | 244,915 | 28,065
Discontinued Operations | Storage Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenue | 105,559 | 109,686 | 138,584
Income before income taxes, excluding gains (losses) from sale transactions and investments | 10,622 | 13,242 | 9,253
Income tax expense | 2,400 | 15,786 | 38,573
Gain (loss) on Shred-it | 25,457 | 354,071 | (3,851)
Income tax expense | (15,057) | (138,184) | (15,910)
Net income from discontinued operations | $ 23,422 | $ 244,915 | $ 28,065

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