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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of business |  | $ 127,835 | $ 0 | $ 0
Gain on sale of business |  | 96,400 | 0 | 0
Discontinued Services |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of business |  | 127,800 |  |
Shred-it Partnership |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of business |  |  |  | 578,300
Gain on sale of business |  |  | 25,500 |
Equity method investment net gain (loss) |  |  |  | 24,300
Amortization of basis difference |  |  |  | 4,800
Realized gain as a result of contingent consideration received | $ 4,300 |  |  |
Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on sale of business |  | $ 96,400 | 0 | 0
Discontinued Operations | Storage Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on sale of business |  |  | $ 2,400 | 4,800
Realized gain as a result of contingent consideration received |  |  |  | 10,900
Proceeds from Storage transactions, net of cash contributed |  |  |  | $ 24,400

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