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Subsequent events	12 Months Ended
Subsequent events	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent events	Subsequent events The Company has evaluated subsequent events through the date the consolidated financial statements are issued. On November 26, 2019, the Company ratified a new collective bargaining agreement with one of its bargaining units. Included within the agreement, was a provision to withdraw from its existing multi-employer plan, the IAM plan. The withdrawal from the IAM plan is subject to a withdrawal liability. The current estimate of the withdrawal liability is approximately $745, subject to finalization. This will be payable in quarterly installments over the next 20 years. The Company is not aware of any other subsequent events which would require recognition or disclosure in the consolidated financial statements.