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Per Share Data
 6 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Per Share Data
Per Share Data
The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts): 
 
 
Three Months Ended 
 March 31,
 
Six Months Ended 
 March 31,
 
 
2015
 
2014
 
2015
 
2014
Numerator for basic and diluted net income per share:
 
 
 
 
 
 
 
 
Net income attributable to ISSI
 
$
1,116

 
$
8,812

 
$
4,302

 
$
14,247

Denominator for basic net income per share:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
31,544

 
29,818

 
31,267

 
29,568

Dilutive stock options and awards
 
1,726

 
1,426

 
1,669

 
1,418

Denominator for diluted net income per share
 
33,270

 
31,244

 
32,936

 
30,986

Basic net income per share
 
$
0.04

 
$
0.30

 
$
0.14

 
$
0.48

Diluted net income per share
 
$
0.03

 
$
0.28

 
$
0.13

 
$
0.46


For the three months and six months ended March 31, 2015, stock options and awards for 118,000 shares and 161,000 shares, respectively, were excluded from diluted earnings per share by the application of the treasury stock method. For the three months and six months ended March 31, 2014, stock options and awards for 1,372,000 shares and 2,177,000 shares, respectively, were excluded from diluted earnings per share by the application of the treasury stock method.