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Stock Option Plans and Equity Incentive Plan (Tables)
 12 Months Ended
May. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Unit Activity
The following table represents restricted stock unit activity for fiscal 2015:
 
Restricted
Stock
Units
 
Weighted Average
Grant Date
Fair Value
Nonvested at June 1, 2014
122

 
$
17.57

Granted
87

 
15.64

Vested
(80
)
 
16.79

Nonvested at May 31, 2015
129

 
$
16.75