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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	$ 5,502us-gaap_AllocatedShareBasedCompensationExpense	$ 4,609us-gaap_AllocatedShareBasedCompensationExpense	$ 4,052us-gaap_AllocatedShareBasedCompensationExpense
Tax benefit	1,862us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1,540us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1,447us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock based compensation expense, net of tax	3,640us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	3,069us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	2,605us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost of Sales [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	232us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	271us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	268us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Research and Development [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	483us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	399us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	738us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Sales and Marketing [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	1,672us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	1,610us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	1,340us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and Administrative [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	3,115us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	2,329us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	1,706us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Operating Expenses [Member]
Summary of stock-based compensation in accordance with authoritative guidance on share based payment awards
Stock based compensation expense	$ 5,270us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	$ 4,338us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	$ 3,784us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember

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- 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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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+ References

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