Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Consolidated Statements of Comprehensive Income (Loss)
Net income including noncontrolling interests	$ 83,853	$ 39,228	$ 108,675
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	14,392	(98,287)	(45,480)
Gain (loss) on cash flow hedge valuations	774	(2,489)	1,029
Other comprehensive income (loss), net of tax	15,166	(100,776)	(44,451)
Comprehensive income (loss) including noncontrolling interests	99,019	(61,548)	64,224
Net income attributable to noncontrolling interests	(70)	(154)	(409)
Foreign currency translation adjustments, net of tax	(3)	143	55
Comprehensive income attributable to noncontrolling interests	(73)	(11)	(354)
Comprehensive income (loss) attributable to Tetra Tech	$ 98,946	$ (61,559)	$ 63,870