Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Consolidated Statements of Comprehensive Income
Net income including noncontrolling interests	$ 26,252	$ 26,711	$ 70,909	$ 85,946
Other comprehensive income, net of tax:
Foreign currency translation adjustments	11,676	19,177	(56,514)	(18,642)
Gain (loss) on cash flow hedge valuations, net of tax	621	(645)	(1,376)	(206)
Other comprehensive income (loss), net of tax	12,297	18,532	(57,890)	(18,848)
Comprehensive income including noncontrolling interests	38,549	45,243	13,019	67,098
Net income attributable to noncontrolling interests	(46)	(54)	(111)	(266)
Foreign currency translation adjustments	14	330	118	403
Comprehensive (income) loss attributable to noncontrolling interests	(32)	276	7	137
Comprehensive income attributable to Tetra Tech	$ 38,517	$ 45,519	$ 13,026	$ 67,235