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Per Share Data (Tables)
 3 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts): 
 
 
Three Months Ended 
 December 31,
 
 
 
2014
 
2013
 
Numerator for basic and diluted net income per share:
 
 
 
 
 
Net income attributable to ISSI
 
$
3,186

 
$
5,435

 
Denominator for basic net income per share:
 
 
 
 
 
Weighted average common shares outstanding
 
30,990

 
29,318

 
Dilutive stock options and awards
 
1,531

 
1,399

 
Denominator for diluted net income per share
 
32,521

 
30,717

 
Basic net income per share
 
$
0.10

 
$
0.19

 
Diluted net income per share
 
$
0.10

 
$
0.18