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Stock Based Compensation Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense before tax $ 2,010 $ 1,812 $ 4,359 $ 3,852
Income taxes (752) (664) (1,605) (1,383)
Net compensation expense 1,258 1,148 2,754 2,469
Cost of revenues
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense before tax 99 70 230 158
Selling, general and administrative
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense before tax 1,706 1,573 3,609 3,248
Research and development
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense before tax $ 205 $ 169 $ 520 $ 446