Annual report pursuant to Section 13 and 15(d)

Revenue from Contracts with Customers - Additional Information (Details)

v3.20.1
Revenue from Contracts with Customers - Additional Information (Details) - USD ($)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Contract with Customer, Asset, after Allowance for Credit Loss $ 10,194 $ 26,454  
Total revenues 383,486,000 412,642,000 $ 308,609,000
Revenue, Remaining Performance Obligation, Amount 105,445    
Increase (Decrease) in Contract with Customer, Asset 16,260    
Contract with Customer, Liability 4,538 6,814  
Revenues recognized at point in time      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total revenues $ 228,497,000 $ 247,606,000  
Percentage of total revenue 59.60% 60.00%  
Revenues recognized over time      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total revenues $ 154,989,000 $ 165,036,000  
Percentage of total revenue 40.40% 40.00%