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Acquisitions and Divestitures (Tables)
 9 Months Ended
Jun. 30, 2020
Business Combinations [Abstract]  
Schedule of Business Acquisitions, by Acquisition The preliminary opening balance sheet for Frontier is summarized as follows:
Current assets
$
3,186

Property, plant and equipment
2,963

Goodwill
1,798

Intangible assets
11,571

Total assets acquired
19,518

Liabilities related to Option and Purchase Right
(7,167
)
Other liabilities assumed
(1,466
)
Net assets acquired
$
10,885