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Discontinued Operations - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Aug. 31, 2015 USD ($) transaction buyer | Aug. 31, 2014 USD ($) | May. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Equity method investments | $ 14,600 |  | $ 225,700
Gain on sale of stock of an equity method investment, net of tax |  | $ 13,600 |
Proceeds from sale of Storage Assets | $ 24,395 | 0 |
Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of transactions involved in sale of business | transaction | 3 |  |
Number of buyers involved in sale of business | buyer | 3 |  |
Proceeds from sale of Storage Assets | $ 24,400 |  |
Gain on sale of business, net of tax | 3,100 |  |
Shred-it | Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Equity method investments | 194,300 |  | $ 210,100
Difference between carrying amount and underlying equity in net assets | $ 91,200 |  |
Amortization period of basis difference | 9 years |  |
Loss on investment in Shred-it, net of tax | $ 9,300 |  |
Amortization of basis difference | $ 2,800 |  |
Gain on sale of stock of an equity method investment, net of tax |  | $ 3,900 |

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