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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details)
$ / shares in Units, $ in Thousands
 7 Months Ended 12 Months Ended
Jul. 31, 2014
USD ($)
Jul. 31, 2015
Mar. 31, 2017
USD ($)
installment
$ / shares
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
shares
Mar. 31, 2014
shares
Employee Benefit Plan            
Share-based compensation expenses capitalized as inventory | $     $ 600 $ 500 $ 500  
Offering period of ESPP Plan   7 months 6 months      
Amount of one-time payment to each participant of the offering expressed as percentage of amount of shares that would have been purchased pursuant to the ESPP 15.00%          
Repurchase of ESPP awards | $ $ 1,100   $ 0 0 1,078  
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)     6,500,000      
2006 Plan            
Employee Benefit Plan            
Number of shares reserved for issuance (in shares)     30,600,000      
Number of shares available for issuance (in shares)     11,200,000      
2012 Stock Inducement Equity Plan            
Employee Benefit Plan            
Number of shares reserved for issuance (in shares)     1,800,000      
Threshold for consecutive trading days     90 days      
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     $ 38      
Tax benefit realized for the tax deduction from options exercised | $     $ 4,200 $ 1,200 $ 500  
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)     1,700,000      
Market Based RSUs            
Employee Benefit Plan            
TSR Period     3 years      
Percent of granted of target number     100.00%      
Market Based RSUs | 2006 Plan            
Employee Benefit Plan            
Vesting period     3 years 3 years 3 years  
Performance-based RSUs | 2006 Plan            
Employee Benefit Plan            
Vesting period     3 years 3 years 3 years  
Restricted Stock Units (RSUs)            
Employee Benefit Plan            
RSUs outstanding (in shares)     6,181,000 5,521,000 4,939,000 6,088,000
Tax benefit realized for the tax deduction from RSUs vested during period | $     $ 13,100 $ 5,100 $ 6,900  
Minimum | Market Based RSUs            
Employee Benefit Plan            
Percent of TSR     0.00%      
Maximum | Market Based RSUs            
Employee Benefit Plan            
Percent of TSR     150.00%      
Non-Executive Board Members | Time-based RSUs | 2006 Plan            
Employee Benefit Plan            
Vesting installment | installment     1