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Discontinued Operations - Narrative (Details)
$ in Thousands
11 Months Ended 12 Months Ended
Jul. 10, 2015
USD ($)
May. 31, 2016
USD ($)
May. 31, 2015
USD ($)
transaction
buyer
May. 31, 2014
USD ($)
May. 31, 2013
USD ($)
Discontinued Operations and Disposal Groups [Abstract]          
Number of transactions involved in sale of business | transaction     3    
Number of buyers involved in sale of business | buyer     3    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from Storage Transactions, net of cash contributed     $ 158,428 $ 0 $ 0
Gain on sale of business     38,573 0 0
Discontinued Operations | Storage Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from Storage Transactions, net of cash contributed     158,400    
Gain on sale of business     $ 38,573 $ 0 $ 0
Subsequent Event | Discontinued Operations, Held-for-sale | Storage Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from Storage Transactions, net of cash contributed $ 24,400        
Scenario, Forecast | Discontinued Operations, Held-for-sale | Storage Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of business   $ 4,500