Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 30, 2012	Jan. 01, 2012
Condensed Consolidated Statements of Comprehensive Income
Net income including noncontrolling interests	$ 26,396	$ 22,703
Other comprehensive income (loss):
Foreign currency translation adjustments	(5,612)	10,827
Foreign currency hedge, net of tax	121	(201)
Other comprehensive income (loss)	(5,491)	10,626
Comprehensive income including noncontrolling interests	20,905	33,329
Net income attributable to noncontrolling interests	(172)	(93)
Foreign currency translation adjustments	13
Comprehensive income attributable to noncontrolling interests	(159)	(93)
Comprehensive income attributable to Tetra Tech	$ 20,746	$ 33,236

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