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Employee Benefit Plans - Other Stock-Based Compensation Plans (Details)
12 Months Ended
Jan. 01, 2018
USD ($)
period
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Other Stock-Based Compensation Plans        
Stock-based compensation expense   $ 2,785,000 $ 2,156,000 $ 1,781,000
Restricted cash   $ 146,000    
ESPP        
Other Stock-Based Compensation Plans        
Purchase price of common stock (as a percent) 95.00%      
Number of offering periods | period 2      
Duration of offering period (in months) 6 months      
Annual stock value $ 25,000      
Number of share repurchases | shares   91,000 92,000 0
Stock-based compensation expense   $ 0    
Restricted cash   $ 146,000    
ESPP | Minimum        
Other Stock-Based Compensation Plans        
Employer matching contribution (as a percent) 1.00%      
ESPP | Maximum        
Other Stock-Based Compensation Plans        
Employer matching contribution (as a percent) 15.00%