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Stockholders' Equity (Tables)
 12 Months Ended
May 31, 2016
Equity [Abstract]  
Schedule summarizes stock option activity
The following table summarizes information about stock options activity for the fiscal year ended May 31, 2016.
 
 
2016
 
Shares
 
Weighted-
average
exercise
price
 
Weighted
average
remaining
contractual
life
 
Aggregate
intrinsic
value (in
thousands)
Outstanding at beginning of year
2,299,313

 
$
14.86

 
 
 
 
Granted
564,380

 
$
14.22

 
 
 
 
Exercised
(145,260
)
 
$
13.73

 
 
 
 
Forfeited
(304,563
)
 
$
13.85

 
 
 
 
Expired
(132,252
)
 
$
22.75

 
 
 
 
Outstanding at end of year
2,281,618

 
$
14.45

 
3.79
 
$
164

Options exercisable at year-end
1,313,698

 
$
14.25

 
2.34
 
$
130

Options expected to vest in future periods
854,189

 
$
14.72

 
5.76
 
$
30
Share based compensation arrangement by share based payment award nonvested shares and weighted average grant date fair value
 The following table summarizes information about restricted stock unit activity for the year ended May 31, 2016.
 
Non-Vested Stock
Award Units
 
Weighted Average
Grant-Date Fair Value
Non-vested at beginning of year
563,101

 
$
13.73

Granted
259,917

 
$
15.21

Vested
(160,845
)
 
$
15.39

Canceled
(112,396
)
 
$
13.81

Non-vested at end of year
549,777

 
$
14.62

Awards expected to vest in future periods
482,594

 
$
14.62