Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Detail)

v3.19.3
Revenue Recognition - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Contract With Customer Assets And Liabilities [Line Items]          
Percentage of revenue from contracts recognized over time 70.00% 65.00% 65.00% 65.00%  
Percentage of revenue from contracts recognized upon shipment 30.00% 35.00% 35.00% 35.00%  
Revenue recognized included in contract liability $ 5,610   $ 11,032    
Unbilled revenue (contract assets)     5,514    
Contract with customer liability increase in contract asset due to contract progress.     6,590    
Contract with customer liability offset by invoicing to customers.     1,076    
Customer deposits, current     1,238    
Contract with customer liability offset by new customer deposits. 9,794   9,794    
Receivables billed but not paid under retainage provisions in its customer contracts 2,319   2,319   $ 2,214
Amortization expense 40 $ 42 86 $ 82  
Revenue remaining unsatisfied performance obligations amount 127,765   127,765    
Customer Deposit [Member]          
Contract With Customer Assets And Liabilities [Line Items]          
Contract liabilities 3,904   3,904   6,382
Prepaid Expenses and Other Current Assets [Member]          
Contract With Customer Assets And Liabilities [Line Items]          
Capitalized costs, net of amortization $ 100   $ 100   $ 133