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Per Share Data
 9 Months Ended
Jun. 30, 2012
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
June 30,
 
Nine Months Ended
June 30,
 
 
2012
 
2011
 
2012
 
2011
Numerator for basic and diluted net income per share:
 
 
 
 
 
 
 
 
Net income attributable to ISSI
 
$
3,137

 
$
8,090

 
$
10,528

 
$
21,083

Denominator for basic net income per share:
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
27,316

 
26,768

 
27,002

 
26,546

Dilutive stock options and awards
 
1,753

 
1,783

 
1,799

 
1,776

Denominator for diluted net income per share
 
29,069

 
28,551

 
28,801

 
28,322

Basic net income per share
 
$
0.11

 
$
0.30

 
$
0.39

 
$
0.79

Diluted net income per share
 
$
0.11

 
$
0.28

 
$
0.37

 
$
0.74


For the three months and nine months ended June 30, 2012, stock options and awards for 1,494,000 and 1,405,000 shares, respectively, were excluded from diluted earnings per share by the application of the treasury stock method. For the three months and nine months ended June 30, 2011, stock options and awards for 1,309,000 and 1,043,000 shares, respectively, were excluded from diluted earnings per share by the application of the treasury stock method.