Basic net income per share is computed using the weighted average number of shares of common stock outstanding for the period. Diluted net income per share is computed using the weighted average number of shares of common stock outstanding for the period and potentially dilutive common shares, including the effect of restricted stock units, performance share awards, and stock options using the treasury stock method. The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:


	Three Months Ended October 31,				Nine Months Ended October 31,
	2022		2021		2022		2021
Numerator:
Net income	$	198	$	137	$	530	$	408
Denominator:
Denominator for basic net income per share—weighted average shares	216		220		217		220
Effect of dilutive securities	1		2		1		2
Denominator for dilutive net income per share	217		222		218		222
Basic net income per share	$	0.92	$	0.62	$	2.44	$	1.85
Diluted net income per share	$	0.91	$	0.62	$	2.43	$	1.84

The computation of diluted net income per share does not include shares that are anti-dilutive under the treasury stock method because their exercise prices are higher than the average market value of Autodesk’s stock during the periods. For the three and nine months ended October 31, 2022, there were 921 thousand and 1,052 thousand anti-dilutive shares excluded from the computation of diluted net income per share, respectively. For the three and nine months ended October 31, 2021, there were 27 thousand and 148 thousand anti-dilutive shares excluded from the computation of diluted net income per share, respectively.