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LEASES - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 USD ($) renewal_option rig | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Operating lease expense | $ 17,300 | $ 18,600 | $ 15,500
Operating lease right-of-use assets | $ 49,187 | $ 44,583 |
Tulsa Corporate Office Lease |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of renewal options | renewal_option | 2 |  |
Renewal option term | 5 years |  |
Tulsa Industrial Facility Lease |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of renewal options | renewal_option | 2 |  |
Renewal option term | 2 years |  |
Houston Assembly Facility |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of renewal options | rig | 1 |  |
Operating lease right-of-use assets | $ 16,000 |  |
Operating Lease, Liability | $ 16,200 |  |
Houston Assembly Facility | Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Renewal option term | 5 years |  |
Houston Assembly Facility | Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Renewal option term | 10 years |  |

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- Definition Lessee Operating Lease, Number Of Options To Extend + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Details
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