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				Six Months Ended
	March 31, 2019		April 1, 2018		March 31, 2019		April 1, 2018
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	55,911	$	28,725	$	97,907	$	74,759

Weighted-average common shares outstanding – basic	55,143		55,841		55,237		55,900
Effect of dilutive stock options and unvested restricted stock	842		832		924		925
Weighted-average common shares outstanding – diluted	55,985		56,673		56,161		56,825

Earnings per share attributable to Tetra Tech:
Basic	$	1.01	$	0.51	$	1.77	$	1.34
Diluted	$	1.00	$	0.51	$	1.74	$	1.32

For both the three and six months of fiscal 2019, 0.1 million options and restricted stock units were excluded from the calculation of dilutive potential common shares, compared to no options for the prior-year periods because the assumed proceeds per share exceeded the average market price per share during the periods. Therefore, their inclusion would have been anti-dilutive.