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EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Share-based compensation expense before income taxes $ 1,779,000 $ 1,512,000 $ 5,290,000 $ 4,194,000  
Income tax benefit (641,000) (526,000) (1,898,000) (1,459,000)  
Total share-based compensation expense after income taxes 1,138,000 986,000 3,392,000 2,735,000  
Net impact of share-based compensation on [Abstract]          
Basic net income per share (in dollars per share) $ 0.05 $ 0.05 $ 0.15 $ 0.12  
Diluted net income per share (in dollars per share) $ 0.05 $ 0.04 $ 0.15 $ 0.12  
Capitalized share-based compensation costs 168,000   168,000   139,000
Excess tax benefits classified as financing cash inflow 681,000 231,000 1,826,000 717,000  
2005 Equity Incentive Plan [Member]
         
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Increase in aggregate number of shares reserved for issuance (in shares) 900,000   900,000    
Amendment to the 2005 equity incentive plan (in shares) 500,000   500,000    
Maximum shares authorized for issuance (in shares) 6,786,000   6,786,000    
Shares available for future issuance (in shares) 1,112,000   1,112,000    
Shares approved by the Board of Directors that have not been granted in accordance with ASC 718-10-55-95 (in shares) 63,000   63,000    
Cost of Revenues [Member]
         
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Share-based compensation expense before income taxes 228,000 187,000 673,000 698,000  
Research and Development [Member]
         
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Share-based compensation expense before income taxes 300,000 226,000 854,000 641,000  
Sales and Marketing [Member]
         
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Share-based compensation expense before income taxes 613,000 475,000 1,885,000 1,402,000  
General and Administrative [Member]
         
Equity Compensation Plan and Allocation of Share-based Compensation [Line Items]          
Share-based compensation expense before income taxes $ 638,000 $ 624,000 $ 1,878,000 $ 1,453,000