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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