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Net Income per Share
 12 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Net Income per Share Net Income per Share
The computations of basic and diluted net income per share for the Company were as follows (in thousands except per share amounts):
 Years Ended March 31,
 202120202019
Net Income $947,257 $449,723 $257,573 
Shares used in net income per share computation:
Weighted average shares outstanding - basic168,523 166,837 165,609 
Effect of potentially dilutive equivalent shares3,252 2,544 3,356 
Weighted average shares outstanding - diluted171,775 169,381 168,965 
   
Net income per share:
Basic$5.62 $2.70 $1.56 
Diluted$5.51 $2.66 $1.52 
Share equivalents attributable to outstanding stock options, RSUs and employee share purchase plan ("ESPP") totaling 0.1 million, 1.7 million, and 1.8 million shares, respectively, during fiscal years 2021, 2020 and 2019 were excluded from the calculation of diluted net income per share because the combined exercise price and average unamortized grant date fair value of these options and ESPP or vesting of RSUs were greater than the average market price of the Company's shares during the periods presented herein, and therefore their inclusion would have been anti-dilutive. Except for fiscal year 2021, performance-based awards in the periods presented were excluded because all necessary conditions have 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 contingency period.