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Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Valuation and Qualifying Accounts      
Balance at Beginning of Period $ 1,984 $ 2,129 $ 1,619
Additions - Charged to costs and expenses 8,161 4,134 5,067
Deductions (6,878) (4,279) (4,557)
Balance at End of Period 3,267 1,984 2,129
Allowance for deferred tax asset [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 712 1,196 1,134
Additions - Charged to costs and expenses 819 0 208
Deductions 0 (484) (146)
Balance at End of Period 1,531 712 1,196
Allowance for sales returns and doubtful accounts [Member]
      
Valuation and Qualifying Accounts      
Balance at Beginning of Period 1,272 933 485
Additions - Charged to costs and expenses 7,342 4,134 4,859
Deductions (6,878) (3,795) (4,411)
Balance at End of Period $ 1,736 $ 1,272 $ 933