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Revenue - Contract Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Change In Contract With Customer, Assets [Roll Forward] |  |
Contract assets - Beginning balance | $ 10,349 | $ 10,140
Additional revenue recognized over-time | 67,043 | 62,499
Less amounts billed to the customers | (65,395) | (62,290)
Contract assets - Ending balance | 11,997 | 10,349
Change In Contract With Customer, Liability [Roll Forward] |  |
Contract liabilities (included within Accrued liabilities) - Beginning balance | (382) | 0
Payments received in advance of performance obligations | (865) | (2,000)
Performance obligations satisfied | 611 | 1,618
Contract liabilities (included within Accrued liabilities) - Ending balance | $ (636) | $ (382)

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- Definition Change In Contract With Customer, Liability [Roll Forward] + References No definition available. + Details
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- Definition Contract With Customer, Asset, Additional Revenue Recognized + References No definition available. + Details
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- Definition Contract With Customer, Asset, Amounts Billed To Customers + References No definition available. + Details
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- Definition Contract With Customer Liability, Liability, Including New Contract Revenue, Recognized + References No definition available. + Details
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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=121556615&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=121556615&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=121604090&loc=SL49130549-203045 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, 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=121556615&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 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 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=121604090&loc=SL49130549-203045 + Details
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