Annual report pursuant to Section 13 and 15(d)

Accounting Standards (Detail)

v3.19.3.a.u2
Accounting Standards (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 12,030 $ 9,334
Inventories 34,291 24,556
Accrued expenses and other current liabilities 19,078 17,520
Billings in excess of costs and estimated earnings on uncompleted contracts 31,115 38,738
Revenues 783,238  
Cost of revenues 665,285 580,560
Provision (benefit) for income taxes 13,909 10,525
Net income 43,121 $ 50,791
Difference between Revenue Guidance in Effect before and after Topic 606 | Impact of ASC 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts (599)  
Inventories 1,602  
Accrued expenses and other current liabilities (39)  
Billings in excess of costs and estimated earnings on uncompleted contracts 1,167  
Revenues (1,766)  
Cost of revenues (1,602)  
Provision (benefit) for income taxes (39)  
Net income (125)  
Calculated under Revenue Guidance in Effect before Topic 606    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts 12,629  
Inventories 32,689  
Accrued expenses and other current liabilities 19,039  
Billings in excess of costs and estimated earnings on uncompleted contracts 29,948  
Revenues 785,004  
Cost of revenues 666,887  
Provision (benefit) for income taxes 13,948  
Net income $ 43,246