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Share Based Awards - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 23, 2018
Dec. 29, 2016
Aug. 11, 2014
Jan. 27, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Aug. 31, 2019
Aug. 31, 2017
Mar. 31, 2017
Aug. 31, 2015
Oct. 31, 2005
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Outstanding stock options         3,001,350 3,166,525 3,670,170     2,885,415    
Total share-based compensation         $ 19,694,000 $ 16,102,000 $ 12,196,000          
Weighted-average grant date fair value per share of stock options           $ 7.18 $ 5.59          
Fair value of options vested         $ 3,940,000 $ 3,985,000 $ 3,059,000          
Percentage of performance stock units tied to 3-year total shareholder return 34.00%                      
Percentage of performance stock units tied to fiscal year 2021 revenue 33.00%                      
Percentage performance stock units tied to fiscal year 2021 adjusted earnings per share goals 33.00%                      
Percentage of performance stock units tied to fiscal year 2021 revenue goal       80.00%                
Percentage of performance stock units tied to fiscal year 2022 revenue goal       20.00%                
2005 Employee Stock Option and Incentive Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock reserved for issuance                       4,800,000
Outstanding stock options         227,020              
2015 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock reserved for issuance               3,575,000 6,000,000      
Common stock reserved                     11,500,000  
Shares available for future grant         6,884,156              
Employee Share Purchase Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock reserved for issuance     4,000,000   3,413,898              
Total share-based compensation         $ 484,000 481,000 362,000          
Maximum percentage of gross payroll deduction     15.00%                  
Purchase price as a percentage of fair market value     90.00%                  
Maximum shares purchase in a single transaction     1,500                  
Maximum amount purchased in a calendar year     $ 25,000                  
Shares issued         586,102              
Employee Stock Options                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Outstanding stock options         2,774,330              
Total share-based compensation         $ 3,826,000 $ 3,936,000 $ 2,953,000          
Total unrecognized compensation costs         $ 4,191,000              
Stock option recognized over weighted average period (in years)         1 year 4 months 24 days              
Employee Stock Options | 2005 Employee Stock Option and Incentive Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expiration period (in years)         10 years              
Share-based compensation award plan , expiration date         May 25, 2015              
Employee Stock Options | 2015 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Expiration period (in years)         10 years              
Number of shares granted         0 326,130 1,479,000          
Restricted Stock                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number         2,312,779              
Performance Shares | 2015 Plan                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number         23,186              
Restricted Stock                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number         2,312,780 1,715,958 1,820,910     902,948    
Total share-based compensation         $ 14,706,000 $ 10,875,000 $ 8,536,000          
Stock option recognized over weighted average period (in years)         1 year 10 months 24 days              
Total unrecognized compensation costs         $ 28,225,000              
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures         1,529,831 885,845 1,424,441          
Restricted Stock | Minimum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period         1 year              
Restricted Stock | Maximum                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Vesting period         3 years              
Performance Stock Awards | Awards Granted On December 2016                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Total share-based compensation         $ 246,000              
Number of shares granted   123,082                    
Vesting period         4 years              
Performance Stock Awards | 2015 Plan | Awards Granted On December 2016                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number         23,186              
Performance Stock Units | Units Granted On October 2018                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Total share-based compensation         $ 123,000 $ 534,000            
Weighted-average grant date fair value per share of stock options $ 17.84                      
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures 248,140                      
Percentage of shares issued, minimum 50.00%                      
Percentage of shares issued, maximum 200.00%                      
Performance Stock Units | Units Granted On December 2019 and January 2020                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Total share-based compensation         $ 309,000              
Weighted-average grant date fair value per share of stock options       $ 16.02                
Share-based compensation arrangement by share-based payment award, options, grants in period, net of forfeitures       279,587                
Percentage of shares issued, minimum       50.00%                
Percentage of shares issued, maximum       150.00%                
Vesting period for the 3-year total shareholder return       3 years