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Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2017 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | Feb. 28, 2017 | Feb. 29, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of business |  |  |  |  | $ 0 | $ 15,786
Proceeds from sale of investment in Shred-it |  |  |  |  | 25,876 | 578,257
Proceeds from sale of Storage assets |  |  |  |  | 0 | 35,338
Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of business | $ 0 | $ 0 |  |  | 0 | 15,786
Discontinued Operations | Document Imaging and Document Retention Services |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of business |  |  |  |  | 10,900 |
Discontinued Operations | Shred-it |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of business |  |  |  |  | $ 25,900 |
Gain on sale of business |  |  | $ 349,700 |  |  |
Proceeds from sale of investment in Shred-it |  |  | $ 578,300 |  |  |
Discontinued Operations | Storage Real Estate Assets |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on disposal of business |  |  |  | $ 4,800 |  |
Proceeds from sale of Storage assets |  |  |  | $ 24,400 |  |
Shred-it Partnership |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loss on investment in Shred-it, net of tax |  | $ 9,300 |  |  |  | $ 24,300

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