SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

12 Months Ended

Sep. 30, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

TETRA TECH, INC.

SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

For the Fiscal Years Ended

October 2, 2016, October 1, 2017 and September 30, 2018

(in thousands)

	Balance at Beginning of Period		Charged to Costs, Expenses and Revenue			Deductions (1)			Other (2)			Balance at End of Period
Allowance for doubtful accounts:
Fiscal 2016	$	31,490	$	8,082		$	(12,191	)	7,852			$	35,233
Fiscal 2017	35,233		2,848			(6,233		)	411			32,259
Fiscal 2018	32,259		7,167			(4,485		)	2,639			37,580
Income tax valuation allowance:
Fiscal 2016	$	7,791	$	3,856		$	—		$	13,800		$	25,447
Fiscal 2017	25,447		(121		)	—			—			25,326
Fiscal 2018	25,326		900						(4,747		)	21,479

⁽¹⁾  Primarily represents uncollectible accounts written off, net of recoveries.

⁽²⁾  Includes allowances from new business acquisitions, loss in foreign jurisdictions, currency adjustments, and valuation allowance adjustments related to net operating loss carry-forwards.