Quarterly report pursuant to Section 13 or 15(d)

Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details)

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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]    
Costs on uncompleted contracts $ 1,190,288 $ 1,058,434
Estimated earnings to date on uncompleted contracts 122,683 110,430
Costs and estimated earnings to date on uncompleted contracts 1,312,971 1,168,864
Billings to date on uncompleted contracts (1,329,763) (1,179,560)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (16,792) $ (10,696)