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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Allowance for deferred tax asset      
Valuation and Qualifying Accounts      
Balance at Beginning of Year $ 48,348 $ 42,209 $ 1,791
Additions - Charged to costs and expenses 0 6,139 40,685
Deductions (21,741) 0 (267)
Balance at End of Period 26,607 48,348 42,209
Allowance for sales returns and doubtful accounts      
Valuation and Qualifying Accounts      
Balance at Beginning of Year 2,945 4,372 3,043
Additions - Charged to costs and expenses 608 (291) 3,748
Deductions (1,087) (1,136) (2,419)
Balance at End of Period $ 2,466 $ 2,945 $ 4,372