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Stockholders' Equity (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	$ 5,422	$ 4,609	$ 4,090
Tax benefit	1,657	1,540	1,386
Stock based compensation expense, net of tax	3,765	3,069	2,704
Cost of Sales [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	232	271	268
Research and Development [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	483	399	738
Sales and Marketing [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	1,672	1,610	1,340
General and Administrative [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	3,035	2,329	1,744
Operating Expenses [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	$ 5,190	$ 4,338	$ 3,822

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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-Name Accounting Standards Codification

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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