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Equity Incentive Plan (Tables)
 3 Months Ended
Aug. 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 the three months ended August 31, 2015:
 
Restricted
Stock
Units
 
Weighted –
Average
Grant
Date
Fair Value
Nonvested at June 1, 2015
129

 
$
16.75

Granted
104

 
11.02

Vested
(65
)
 
16.83

Forfeited/canceled
(6
)
 
16.72

Nonvested at August 31, 2015
162

 
$
13.02