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Discontinued Operations - Assets and Liabilities (Details) - USD ($)
$ in Millions
Aug. 31, 2016
May 31, 2016
Aug. 31, 2015
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Current assets of discontinued operations $ 0.5 $ 0.5 $ 0.9
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]      
Current liabilities of discontinued operations 0.3 1.2 3.0
Discontinued Operations      
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]      
Accounts receivable, net 0.0 0.0 0.4
Inventories, net 0.0 0.0 0.1
Prepaid expenses and other current assets 0.5 0.5 0.4
Current assets of discontinued operations 0.5 0.5 0.9
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]      
Accounts payable 0.0 0.0 0.1
Accrued royalties 0.0 0.0 0.7
Deferred revenue 0.0 0.0 0.1
Other accrued expenses 0.3 1.2 2.1
Current liabilities of discontinued operations $ 0.3 $ 1.2 $ 3.0