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Subsequent Events (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 15, 2015
Jun. 29, 2015
May. 31, 2015
May. 31, 2014
May. 31, 2013
Subsequent Event [Line Items]          
Sale of equity method investment     $ 29,933 $ 0 $ 0
Subsequent Event          
Subsequent Event [Line Items]          
Business acquisition, consideration   $ 130,000      
Minimum | Subsequent Event          
Subsequent Event [Line Items]          
Expected revenue of business acquisition   110,000      
Maximum | Subsequent Event          
Subsequent Event [Line Items]          
Expected revenue of business acquisition   $ 120,000      
Shred-it Partnership | Minimum | Subsequent Event          
Subsequent Event [Line Items]          
Sale of equity method investment $ 550,000        
Shred-it Partnership | Maximum | Subsequent Event          
Subsequent Event [Line Items]          
Sale of equity method investment $ 600,000