Contingencies	12 Months Ended
Sep. 30, 2011
CONTINGENCIES [Abstract]
Contingencies Disclosure [Text Block]	CONTINGENCIES Legal Matters From time to time, various lawsuits, claims and proceedings have been, and may in the future be, instituted or asserted against the Company, including those pertaining to patent infringement, intellectual property, environmental, product liability, safety and health, employment and contractual matters. Additionally, the semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights. From time to time, third parties have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights to technologies that are important to the Company's business and have demanded, and may demand in the future, that the Company license their technology. The outcome of any such litigation cannot be predicted with certainty and some such lawsuits, claims or proceedings may be disposed of unfavorably to the Company. Generally speaking, intellectual property disputes often have a risk of injunctive relief, which, if imposed against the Company, could materially and adversely affect the Company's financial condition, or results of operations. From time to time, the Company is also involved in legal proceedings in the ordinary course of business. On May 26, 2011, the Company announced it had entered into an agreement and plan of merger (the “Merger Agreement”) with PowerCo Acquisition Corp., a wholly owned subsidiary of the Company (“Merger Sub”) and AATI pursuant to which the Merger Sub will, subject to the satisfaction or waiver of the conditions in the Merger Agreement, merge with and into AATI, and AATI will survive the merger and become a wholly owned subsidiary of the Company (the “Merger”). Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each outstanding share of AATI common stock (except for shares held directly or indirectly by the Company, Merger Sub, AATI or any wholly owned subsidiary of AATI, and except for shares of AATI common stock held by stockholders exercising dissenter’s rights) will automatically be converted into the right to receive an aggregate of $6.13 per share. Skyworks and AATI are parties to an arbitration proceeding, in which Skyworks is seeking to be released from its obligations to proceed with the transactions contemplated by the Merger Agreement and AATI is seeking to require Skyworks to consummate the transactions contemplated by the Merger Agreement. Skyworks' petition, filed on September 26, 2011 and thereafter amended, asserts claims against AATI for breach of Sections 5.1, 5.1(k), 5.1(n), 6.2 and 6.4 of the Merger Agreement and claims based on misrepresentations by AATI to Skyworks dating to before the signing of the Merger Agreement, and seeks an order (a) declaring that Skyworks is relieved of its obligations under the Merger Agreement, (b) declaring that Skyworks is entitled to terminate the Merger Agreement, and (c) in the alternative, awarding damages in an amount to be proven at final hearing. AATI's petition, filed by AATI on September 23, 2011, asserts claims against Skyworks for breach of the Merger Agreement and seeks (x) a declaratory judgment from the Court (i) that AATI has not breached the merger agreement, (ii) that no “material adverse effect” has occurred with respect to AATI, and (iii) that Skyworks has breached its obligations under the Merger Agreement, (y) an order of specific performance of the Merger Agreement compelling Skyworks to close the merger, and (z) in the alternative, damages in an amount to be proven at final hearing. The petitions have been consolidated for all purposes of the arbitration proceedings, and the hearing is currently scheduled to take place in the last week of November and the first week of December 2011. Under Delaware law, applicable stipulations and orders, and the applicable provisions of the Merger Agreement, the arbitration proceedings are confidential, subject to the parties' disclosure obligations under federal securities law and other applicable laws. Skyworks is unable to predict the outcome of the proceedings. On June 6, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202403) (the "Bushansky action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. The complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) failing to take steps to maximize the value of the merger consideration to AATI's stockholders, (b) taking steps to avoid competitive bidding, and (c) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The complaint seeks to enjoin consummation of the merger or, if the merger is completed, to recover damages caused by the alleged breaches of fiduciary duties. The complaint also seeks recovery of attorney's fees and costs of the lawsuit. On June 7, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202501) (the "Venette action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. Plaintiffs filed an amended complaint on July 14, 2011 (the "Amended Complaint"). The Amended Complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) agreeing to the merger for inadequate consideration on unfair terms, (b) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, (c) selling the company in response to alleged pressure from Dialectic Capital Partners, LP ("Dialectic"), (d) taking steps to avoid competitive bidding (including the entry by certain AATI officers and directors into agreements with the Company relating to voting commitments and inclusion in the merger agreement of nonsolicitation provisions and a termination fee), and (e) by causing the issuance of a materially misleading Form S-4 Registration Statement which, inter alia, purportedly fails to disclose material facts surrounding (i) Dialectic's impact on the proposed merger process, (ii) the AATI board of directors' evaluation of the Company and its offer for AATI, and (iii) supporting figures and analysis regarding the fairness opinion that the AATI Board obtained from its financial advisor, Needham & Company, LLC, in connection with the transaction and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The Amended Complaint seeks to enjoin consummation of the merger, and to have the court direct the defendants to implement procedures and processes to maximize shareholder value. The Amended Complaint also seeks recovery of attorney's fees and costs of the lawsuit. On July 26, 2011, the Court issued an order consolidating the Bushansky action and Venette action into a single, consolidated action captioned In re Advanced Analogic Technologies Inc. Shareholder Litigation, Lead Case No. 111CV202403, and designating the Amended Complaint as the operative complaint in the litigation. The Company believes that the claims in the consolidated action are without merit and intends to defend against such claims vigorously. The Company believes there are no other litigation pending that will have, individually or in the aggregate, a material adverse effect on its business

CONTINGENCIES

Legal Matters

From time to time, various lawsuits, claims and proceedings have been, and may in the future be, instituted or asserted against the Company, including those pertaining to patent infringement, intellectual property, environmental, product liability, safety and health, employment and contractual matters.

Additionally, the semiconductor industry is characterized by vigorous protection and pursuit of intellectual property rights. From time to time, third parties have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights to technologies that are important to the Company's business and have demanded, and may demand in the future, that the Company license their technology. The outcome of any such litigation cannot be predicted with certainty and some such lawsuits, claims or proceedings may be disposed of unfavorably to the Company. Generally speaking, intellectual property disputes often have a risk of injunctive relief, which, if imposed against the Company, could materially and adversely affect the Company's financial condition, or results of operations. From time to time, the Company is also involved in legal proceedings in the ordinary course of business.

On May 26, 2011, the Company announced it had entered into an agreement and plan of merger (the “Merger Agreement”) with PowerCo Acquisition Corp., a wholly owned subsidiary of the Company (“Merger Sub”) and AATI pursuant to which the Merger Sub will, subject to the satisfaction or waiver of the conditions in the Merger Agreement, merge with and into AATI, and AATI will survive the merger and become a wholly owned subsidiary of the Company (the “Merger”). Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each outstanding share of AATI common stock (except for shares held directly or indirectly by the Company, Merger Sub, AATI or any wholly owned subsidiary of AATI, and except for shares of AATI common stock held by stockholders exercising dissenter’s rights) will automatically be converted into the right to receive an aggregate of $6.13 per share.

Skyworks and AATI are parties to an arbitration proceeding, in which Skyworks is seeking to be released from its obligations to proceed with the transactions contemplated by the Merger Agreement and AATI is seeking to require Skyworks to consummate the transactions contemplated by the Merger Agreement. Skyworks' petition, filed on September 26, 2011 and thereafter amended, asserts claims against AATI for breach of Sections 5.1, 5.1(k), 5.1(n), 6.2 and 6.4 of the Merger Agreement and claims based on misrepresentations by AATI to Skyworks dating to before the signing of the Merger Agreement, and seeks an order (a) declaring that Skyworks is relieved of its obligations under the Merger Agreement, (b) declaring that Skyworks is entitled to terminate the Merger Agreement, and (c) in the alternative, awarding damages in an amount to be proven at final hearing. AATI's petition, filed by AATI on September 23, 2011, asserts claims against Skyworks for breach of the Merger Agreement and seeks (x) a declaratory judgment from the Court (i) that AATI has not breached the merger agreement, (ii) that no “material adverse effect” has occurred with respect to AATI, and (iii) that Skyworks has breached its obligations under the Merger Agreement, (y) an order of specific performance of the Merger Agreement compelling Skyworks to close the merger, and (z) in the alternative, damages in an amount to be proven at final hearing. The petitions have been consolidated for all purposes of the arbitration proceedings, and the hearing is currently scheduled to take place in the last week of November and the first week of December 2011. Under Delaware law, applicable stipulations and orders, and the applicable provisions of the Merger Agreement, the arbitration proceedings are confidential, subject to the parties' disclosure obligations under federal securities law and other applicable laws. Skyworks is unable to predict the outcome of the proceedings.

On June 6, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202403) (the "Bushansky action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. The complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) failing to take steps to maximize the value of the merger consideration to AATI's stockholders, (b) taking steps to avoid competitive bidding, and (c) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The complaint seeks to enjoin consummation of the merger or, if the merger is completed, to recover damages caused by the alleged breaches of fiduciary duties. The complaint also seeks recovery of attorney's fees and costs of the lawsuit.

On June 7, 2011, a putative stockholder class action lawsuit was filed in California Superior Court in Santa Clara County (Case No. 111CV202501) (the "Venette action") naming AATI, the members of AATI's board of directors, the Company and Merger Sub as defendants. Plaintiffs filed an amended complaint on July 14, 2011 (the "Amended Complaint"). The Amended Complaint alleges, among other things, (1) that the members of AATI's board of directors breached their fiduciary duties by (a) agreeing to the merger for inadequate consideration on unfair terms, (b) failing to protect against conflicts of interest resulting from change-of-control and transaction-related benefits received by AATI directors in connection with the merger that are not available to all stockholders, (c) selling the company in response to alleged pressure from Dialectic Capital Partners, LP ("Dialectic"), (d) taking steps to avoid competitive bidding (including the entry by certain AATI officers and directors into agreements with the Company relating to voting commitments and inclusion in the merger agreement of nonsolicitation provisions and a termination fee), and (e) by causing the issuance of a materially misleading Form S-4 Registration Statement which, inter alia, purportedly fails to disclose material facts surrounding (i) Dialectic's impact on the proposed merger process, (ii) the AATI board of directors' evaluation of the Company and its offer for AATI, and (iii) supporting figures and analysis regarding the fairness opinion that the AATI Board obtained from its financial advisor, Needham & Company, LLC, in connection with the transaction and (2) that AATI, the members of AATI's board of directors, the Company and Merger Sub aided and abetted these purported breaches of fiduciary duties. The Amended Complaint seeks to enjoin consummation of the merger, and to have the court direct the defendants to implement procedures and processes to maximize shareholder value. The Amended Complaint also seeks recovery of attorney's fees and costs of the lawsuit.

On July 26, 2011, the Court issued an order consolidating the Bushansky action and Venette action into a single, consolidated action captioned In re Advanced Analogic Technologies Inc. Shareholder Litigation, Lead Case No. 111CV202403, and designating the Amended Complaint as the operative complaint in the litigation. The Company believes that the claims in the consolidated action are without merit and intends to defend against such claims vigorously.

The Company believes there are no other litigation pending that will have, individually or in the aggregate, a material adverse effect on its business