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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2018
USD ($)
installment
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
shares
Employee Benefit Plan        
Share-based compensation expenses capitalized as inventory | $ $ 0.7 $ 0.6 $ 0.5  
Offering period of ESPP Plan 6 months      
Percent of granted and vested of target number 100.00%      
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      
Number of shares available for issuance (in shares) 5,900,000      
2006 Plan        
Employee Benefit Plan        
Number of shares reserved for issuance (in shares) 30,600,000      
Number of shares available for issuance (in shares) 10,600,000      
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      
Employee Stock Option        
Employee Benefit Plan        
Exercise price, lower range limit (in dollars per share) | $ / shares $ 4      
Exercise price, upper range limit (in dollars per share) | $ / shares $ 26      
Tax benefit realized for the tax deduction from options exercised | $ $ 1.8 $ 4.2 $ 1.2  
Employee Stock Option | 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) 1,400,000      
Market-based and performance-based RSUs | 2006 Plan        
Employee Benefit Plan        
Vesting period 3 years      
TSR Period 3 years      
Performance period 3 years      
Market Based RSUs | 2006 Plan        
Employee Benefit Plan        
Vesting period 3 years   3 years  
Performance-based RSUs | 2006 Plan        
Employee Benefit Plan        
Vesting period   3 years 3 years  
Restricted Stock Units (RSUs)        
Employee Benefit Plan        
RSUs outstanding (in shares) 5,221,000 6,181,000 5,521,000 4,939,000
Tax benefit realized for the tax deduction from RSUs vested during period | $ $ 20.3 $ 13.1 $ 5.1  
Minimum | Market Based RSUs        
Employee Benefit Plan        
Percent of TSR   0.00% 0.00%  
Maximum | Market Based RSUs        
Employee Benefit Plan        
Percent of TSR   150.00% 150.00%  
Non-Executive Board Members | Time-based RSUs | 2006 Plan        
Employee Benefit Plan        
Vesting installment | installment 1