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Contract Assets and Liabilities - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings (Details) $ in Thousands | 6 Months Ended
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Mar. 31, 2020 USD ($)
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts |
Contract asset, beginning balance | $ 12,030
Changes in revenue billed, contract price or cost estimates | 4,071
Contract asset, ending balance | 16,101
Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts |
Contract liability, beginning balance | (31,115)
Changes in revenue billed, contract price or cost estimates | 1,575
Contract liability, ending balance | (29,540)
Net Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts |
Net billings in excess of costs, beginning balance | (19,085)
Changes in revenue billed, contract price or cost estimates | 5,646
Net billings in excess of costs, Ending balance | $ (13,439)

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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