Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2013	Dec. 30, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income including noncontrolling interests	$ 27,327	$ 26,396
Other comprehensive income:
Foreign currency translation adjustments, net of tax	(22,135)	(5,612)
Gain on cash flow hedge valuations, net of tax	826	121
Other comprehensive loss	(21,309)	(5,491)
Comprehensive income including noncontrolling interests	6,018	20,905
Net income attributable to noncontrolling interests	(12)	(172)
Foreign currency translation adjustments, net of tax	38	13
Comprehensive loss (income) attributable to noncontrolling interests	26	(159)
Comprehensive income attributable to Tetra Tech	$ 6,044	$ 20,746