Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted average number of dilutive common shares outstanding during the period. Diluted shares outstanding are calculated by adding to the weighted average shares outstanding any potential dilutive securities outstanding for the period. Potential dilutive securities include stock options, restricted stock units, performance-based stock awards and shares to be purchased under the Company’s employee stock purchase plan. The Company’s basic and diluted net income per share for the three and six months ended September 30, 2019 and 2018 were as follows (in thousands, except per share data):

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
Basic Net Income Per Share		2019		2018		2019		2018
Net income	$	13,071	$	50,127	$	101,994	$	140,193

Weighted average shares - basic		45,319		44,961		45,267		44,754

Net income per share - basic	$	0.29	$	1.11	$	2.25	$	3.13

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
Diluted Net Income Per Share		2019		2018		2019		2018
Net income	$	13,071		50,127		101,994		140,193

Weighted average shares - basic		45,319		44,961		45,267		44,754
Effect of dilutive securities		593		1,192		764		1,410
Weighted average shares - diluted		45,912		46,153		46,031		46,164

Net income per share - diluted	$	0.28	$	1.09	$	2.22	$	3.04

Share-based compensation awards of approximately 0.3 million and 0.1 million shares for the three months ended September 30, 2019, and 2018, respectively, and approximately 0.3 million and 0.2 million for the six months ended September 30, 2019, and 2018, respectively, were outstanding but were not included in the computation of diluted net income per share because the effect of including such shares would have been anti-dilutive or are contingently issuable upon meeting performance criteria in the periods presented.