Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Comprehensive Income
Net income including noncontrolling interests	$ 29,168	$ 24,748	$ 74,192	$ 65,583
Other comprehensive income:
Foreign currency translation adjustment	(7,199)	1,947	12,986	22,532
Foreign currency hedge	170	5	(44)	(320)
Comprehensive income including noncontrolling interests	22,139	26,700	87,134	87,795
Net income attributable to noncontrolling interests	(114)	(909)	(244)	(1,944)
Foreign currency translation adjustment	11	(68)	(3)	(815)
Comprehensive income attributable to noncontrolling interests	(103)	(977)	(247)	(2,759)
Comprehensive income attributable to Tetra Tech	$ 22,036	$ 25,723	$ 86,887	$ 85,036

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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