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Earnings per Share ("EPS")
3 Months Ended
Dec. 27, 2020
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 Ended
 December 27,
2020
December 29,
2019
 (in thousands, except per share data)
Net income attributable to Tetra Tech$52,436 $47,310 
Weighted-average common shares outstanding – basic53,927 54,560 
Effect of dilutive stock options and unvested restricted stock710 878 
Weighted-average common shares outstanding – diluted54,637 55,438 
Earnings per share attributable to Tetra Tech:  
Basic$0.97 $0.87 
Diluted$0.96 $0.85