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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 29, 2019 | Dec. 30, 2018
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 47,317 | $ 42,032
Other comprehensive income, net of tax |  |
Foreign currency translation adjustment, net of tax | 13,899 | (23,334)
Gain (loss) on cash flow hedge valuations, net of tax | 1,670 |
Gain (loss) on cash flow hedge valuations, net of tax |  | (4,009)
Other comprehensive income (loss) attributable to Tetra Tech, net of tax | 15,569 | (27,343)
Other comprehensive income attributable to noncontrolling interests, net of tax | 2 | 237
Comprehensive income attributable to Tetra Tech, net of tax | 62,879 | 14,654
Comprehensive income attributable to noncontrolling interests, net of tax | 9 | 272
Comprehensive income, net of tax | $ 62,888 | $ 14,926

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