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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2020
USD ($)
installment
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
shares
Employee Benefit Plan        
Share-based compensation expenses capitalized as inventory | $ $ 900 $ 900 $ 700  
Offering period of ESPP Plan 6 months      
Percent of granted and vested of target number 100.00%      
Exercise price, lower range limit (in dollars per share) | $ / shares $ 2      
Exercise price, upper range limit (in dollars per share) | $ / shares $ 40      
Tax benefit realized for the tax deduction from options exercised | $ $ 50 $ 200 $ 1,800  
1996 ESPP and 2006 ESPP        
Employee Benefit Plan        
Purchase price of shares expressed as percentage of the fair market value 85.00%      
Number of shares reserved for issuance (in shares) 29,000,000.0      
Number of shares available for issuance (in shares) 4,900,000      
2006 Plan        
Employee Benefit Plan        
Number of shares reserved for issuance (in shares) 30,600,000      
Number of shares available for issuance (in shares) 8,600,000      
2012 Stock Inducement Equity Plan        
Employee Benefit Plan        
Number of shares reserved for issuance (in shares) 1,800,000      
Number of shares available for issuance (in shares) 0      
Stock Options | 2006 Plan        
Employee Benefit Plan        
Expiration period 10 years      
Time-based RSUs | 2006 Plan        
Employee Benefit Plan        
Vesting installment | installment 4      
Market-based and performance-based RSUs        
Employee Benefit Plan        
RSUs outstanding (in shares) 1,000,000.0      
Market-based and performance-based RSUs | 2006 Plan        
Employee Benefit Plan        
Performance period 3 years      
TSR Period 3 years      
Restricted Stock Units (RSUs)        
Employee Benefit Plan        
RSUs outstanding (in shares) 3,951,000 4,421,000 5,221,000 6,181,000
Tax benefit realized for the tax deduction from RSUs vested during period | $ $ 12,100 $ 16,200 $ 20,300