Valuation and Qualifying Accounts

12 Months Ended

Sep. 30, 2017

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II

Geospace Technologies Corporation and Subsidiaries

Valuation and Qualifying Accounts

(In thousands)

	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Assets		(Deductions) and Additions			Balance at End of Period
Year ended September 30, 2017
Allowance for doubtful accounts on accounts and financing receivables	$	2,949	$	(380	)	$	—	$	(154	)	$	2,415
Year ended September 30, 2016
Allowance for doubtful accounts on accounts and financing receivables		2,516		763			—		(330	)		2,949
Year ended September 30, 2015
Allowance for doubtful accounts on accounts and financing receivables		1,125		2,147			—		(756	)		2,516
	Balance at Beginning of Period		Charged to Costs and Expenses			Charged to Other Assets		(Deductions) and Additions			Balance at End of Period
Year ended September 30, 2017
Inventory obsolescence reserve	$	9,674	$	21,472		$	—	$	(1,532	)	$	29,614
Year ended September 30, 2016
Inventory obsolescence reserve		6,675		10,590			—		(7,591	)		9,674
Year ended September 30, 2015
Inventory obsolescence reserve		7,764		3,887			—		(4,976	)		6,675