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Per Share Data
 6 Months Ended
Mar. 31, 2014
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,
 
 
2014
 
2013
 
2014
 
2013
Numerator for basic and diluted net income per share:
 
 
 
 
 
 
 
 
Net income attributable to ISSI
 
$
8,812

 
$
3,287

 
$
14,247

 
$
5,786

Denominator for basic net income per share:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
29,818

 
27,976

 
29,568

 
27,836

Dilutive stock options and awards
 
1,426

 
1,372

 
1,418

 
1,404

Denominator for diluted net income per share
 
31,244

 
29,348

 
30,986

 
29,240

Basic net income per share
 
$
0.30

 
$
0.12

 
$
0.48

 
$
0.21

Diluted net income per share
 
$
0.28

 
$
0.11

 
$
0.46

 
$
0.20


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. For the three months and six months ended March 31, 2013, stock options and awards for 2,998,000 shares and 3,033,000 shares, respectively, were excluded from diluted earnings per share by the application of the treasury stock method.