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Net Income Per Share
 6 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per Share
 
The following table summarizes the computations of basic and diluted net income per share for the three and six months ended September 30, 2025 and 2024 (in thousands, except per share amounts):
Three Months Ended
September 30,		Six Months Ended
September 30,
 2025202420252024
Net income$170,670 $145,483 $316,685 $287,316 
Shares used in net income per share computation:    
Weighted average shares outstanding - basic147,123 152,460 147,487 152,875 
Effect of potentially dilutive equivalent shares1,299 1,212 1,244 1,445 
Weighted average shares outstanding - diluted148,422 153,672 148,731 154,320 
Net income per share:    
Basic$1.16 $0.95 $2.15 $1.88 
Diluted$1.15 $0.95 $2.13 $1.86 
 
Share equivalents attributable to outstanding stock options, restricted stock units and employee share purchase plans totaling 0.2 million and 0.9 million for the three months ended September 30, 2025 and 2024, respectively, and 0.9 million and 1.0 million for the six months ended September 30, 2025 and 2024, respectively, were excluded from the calculation of diluted net income per share because their effect would have been antidilutive. A small number of performance-based restricted stock units were not included in the diluted net income per share calculation because all necessary conditions had not been satisfied by the end of the respective period, and those shares were not issuable if the end of the reporting period were the end of the performance contingency period.