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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
Feb. 28, 2017
Feb. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Amortization of interest rate locks $ (615)     $ (783)     $ (1,845) $ (2,348)
Tax benefit 230     295     690 884
Amortization of interest rate locks, net of tax (385)     (488)     (1,155) (1,464)
Total amount reclassified out of accumulated other comprehensive income (385) $ (385) $ (385) (488) $ (6,960) $ (488)    
Accumulated Translation Adjustment on Investment Attributable to Parent                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Tax benefit 0     0     0 3,909
Cumulative translation adjustment on Shred-it 0     0     0 (10,381)
Total amount reclassified out of accumulated other comprehensive income $ 0     $ 0     $ 0 $ (6,472)