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Subsequent Event	9 Months Ended
Subsequent Event	Jun. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event In July 2012, the Company announced that it had entered into a definitive agreement with the major shareholders of Chingis Technology Corporation (Chingis) under which ISSI intends to acquire all of the outstanding shares of Chingis pursuant to a cash tender offer valued at $33 million, or $16 million net of the approximately $17 million in cash expected to be on Chingis' balance sheet at closing. The transaction is expected to close in September 2012. Completion of the transaction is conditioned on at least 60% of the Chingis shares being tendered (which condition had been met at the time of this Form 10-Q filing), regulatory approvals in Taiwan and other customary closing conditions. Founded in 1995, Chingis provides a variety of NOR flash memory technologies used in standalone and embedded applications with more than 80 worldwide patents and patents pending. The company has 75 employees in Taiwan, Korea, China and the United States.