Contract Liabilities and Other Disclosures (Tables)

6 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of changes in contract liabilities

The following table summarizes the changes in contract liabilities: 

	Deferred Income
Balance at October 1, 2018	$	(33,140	)
Revenue recognized		6,066
Revenue deferred		(3,633	)
Foreign currency translation adjustments		845
Balance at March 31, 2019	$	(29,862	)

	Deferred Income
Balance at October 1, 2017	$	(27,353	)
Revenue recognized		10,597
Revenue deferred		(16,921	)
Foreign currency translation adjustments		537
Balance at September 30, 2018	$	(33,140	)

Schedule of contract related balances (other than deferred income disclosed above)

The following table summarizes contract related balances (other than deferred income disclosed above): 

	Accounts Receivable		Unbilled Accounts Receivable		Customer Prepayments and Deposits
At October 1, 2018	$	17,791		10,771		(3,719	)
At March 31, 2019		16,741		10,345		(2,939	)

	Accounts Receivable		Unbilled Accounts Receivable		Customer Prepayments and Deposits
At October 1, 2017	$	25,527		9,542		(4,346	)
At September 30, 2018		17,791		10,771		(3,719	)