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Quarterly Financial Information - Unaudited
 12 Months Ended
Sep. 27, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information - Unaudited Quarterly Financial Information – Unaudited
In the opinion of management, the following unaudited quarterly data for the fiscal years ended September 27, 2020 and September 29, 2019 reflect all adjustments necessary for a fair statement of the results of operations.
In the second quarter of fiscal 2020, we incurred incremental costs totaling $8.2 million to address the COVID-19 pandemic. In the fourth quarter of fiscal 2020, we recorded adjustments to our contingent earn-out liabilities and reported related net gains in operating income of $13.5 million. Additionally, we recorded a $15.8 million goodwill impairment charge related to the ASP reporting unit, which is in our CIG segment. We sold non-core equipment related to the disposal of our Canadian turn-key pipeline activities throughout fiscal 2020 which resulted in gains of $0.8 million, $2.2 million, $4.5 million, and $1.0 million in the first, second, third, and fourth quarters of fiscal 2020, respectively.
In the second quarter of fiscal 2019, deferred tax valuation allowances of $22.3 million in Australia were released due to sufficient positive evidence obtained. During the fourth quarter of fiscal 2019, we decided to dispose of the Canadian turn-key pipeline activities in our CIG segment. As a result, we recorded a $7.8 million goodwill impairment charge and other charges for severance and other disposition costs totaling $10.9 million. Also in the fourth quarter of fiscal 2019, we incurred acquisition and transaction charges of $10.4 million related to the acquisition of WYG.
 First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
 (in thousands, except per share data)
Fiscal Year 2020    
Revenue$797,623 $734,133 $709,771 $753,364 
Income from operations63,302 47,530 63,525 66,735 
Net income attributable to Tetra Tech47,310 36,397 45,497 44,654 
Earnings per share attributable to Tetra Tech:    
Basic$0.87 $0.67 $0.84 $0.83 
Diluted$0.85 $0.66 $0.83 $0.82 
Weighted-average common shares outstanding:    
Basic54,560 54,699 53,985 53,841 
Diluted55,438 55,463 54,692 54,603 
Fiscal Year 2019    
Revenue$717,431 $722,621 $825,793 $841,502 
Income from operations55,711 47,545 64,841 20,665 
Net income attributable to Tetra Tech41,997 55,911 49,233 11,527 
Earnings per share attributable to Tetra Tech:    
Basic$0.76 $1.01 $0.90 $0.21 
Diluted$0.75 $1.00 $0.88 $0.21 
Weighted-average common shares outstanding:    
Basic55,390 55,143 54,819 54,617 
Diluted56,366 55,985 55,768 55,618