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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Statement of Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 117,917	$ 83,853	$ 39,228
Foreign currency translation adjustments	27,902	14,392	(98,287)
Gain (loss) on cash flow hedge valuations	1,614	774	(2,489)
Other comprehensive income (loss), net of tax	29,516	15,166	(100,776)
Comprehensive income (loss) including noncontrolling interests	147,433	99,019	(61,548)
Net income attributable to noncontrolling interests	(43)	(70)	(154)
Foreign currency translation adjustments, net of tax	(8)	(3)	143
Comprehensive income attributable to noncontrolling interests	(51)	(73)	(11)
Comprehensive income (loss) attributable to Tetra Tech	$ 147,382	$ 98,946	$ (61,559)

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