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Earnings per Share ("EPS")
6 Months Ended
Mar. 28, 2021
Earnings Per Share [Abstract]  
Earnings per Share ("EPS") Earnings per Share (“EPS”)
Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding, less unvested restricted stock for the period. Diluted EPS is computed by dividing net income by the weighted-average number of common shares outstanding and dilutive potential common shares for the period. Potential common shares include the weighted-average dilutive effects of outstanding stock options and unvested restricted stock using the treasury stock method.

The following table presents the number of weighted-average shares used to compute basic and diluted EPS:

 Three Months EndedSix Months Ended
 March 28,
2021
March 29,
2020
March 28,
2021
March 29,
2020
 (in thousands, except per share data)
Net income attributable to Tetra Tech$45,517 $36,397 $97,953 $83,707 
Weighted-average common shares outstanding – basic54,187 54,699 54,085 54,541 
Effect of dilutive stock options and unvested restricted stock549 764 630 839 
Weighted-average common shares outstanding – diluted54,736 55,463 54,715 55,380 
Earnings per share attributable to Tetra Tech:    
Basic$0.84 $0.67 $1.81 $1.53 
Diluted$0.83 $0.66 $1.79 $1.51