Contract Liabilities and Other Disclosures

6 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Contract Liabilities and Other Disclosures

10. Contract Liabilities and Other Disclosures

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	)

Revenue recognized that was included in the deferred income balance at the beginning of the period amounted to $5,487 and $8,048 for the six months ended March 31, 2019 and the year ended September 30, 2018, respectively. 

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	)