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Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	May 31, 2018 USD ($) $ / shares shares
Schedule summarizes stock option activity
Shares Outstanding at beginning of year (shares) | shares	1,667,443
Shares Granted (shares) | shares	518,498
Shares Exercised (shares) | shares	(271,344)
Shares Forfeited (shares) | shares	(204,184)
Shares Expired (shares) | shares	(14,000)
Shares Outstanding at end of year (shares) | shares	1,696,413
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, Outstanding at beginning of year (usd per share) | $ / shares	$ 15.01
Weighted average exercise price Granted (usd per share) | $ / shares	16.78
Weighted average exercise price Exercised (usd per share) | $ / shares	14.83
Weighted average exercise price Forfeited (usd per share) | $ / shares	16.24
Weighted average exercise price Expired (usd per share) | $ / shares	15.75
Weighted average exercise price, Outstanding at end of year (usd per share) | $ / shares	$ 15.42
Shares Options exercisable at year-end (shares) | shares	652,543
Shares Options expected to vest in future periods (shares) | shares	1,043,870
Weighted average exercise price, Options exercisable at year end (usd per share) | $ / shares	$ 14.41
Weighted average exercise price, Options expected to vest in future periods (usd per share) | $ / shares	$ 16.05
Weighted average remaining contractual life	5 years 6 months 30 days
Weighted average remaining contractual life, Option exercisable at year end	3 years 5 months 23 days
Weighted average remaining contractual life, Option expected to vest in future periods	6 years 10 months 25 days
Aggregate intrinsic value, Outstanding at end of year | $	$ 9,520
Aggregate intrinsic value, Options exercisable at year end | $	4,321
Aggregate intrinsic value, Option expected to vest in future periods | $	$ 5,199

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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