Subsequent Events	9 Months Ended
Oct. 02, 2011
Subsequent Events [Abstract]
Subsequent Events	Note 16 — Subsequent Events On October 26, 2011, the Company entered into a definitive agreement to acquire SandForce, Inc. (“SandForce”), a leading provider of flash storage processors for enterprise and client flash solutions and solid state drives. The acquisition is expected to enhance LSI’s position in storage technology solutions. Under the agreement, LSI will pay approximately $322 million in cash, net of cash acquired, and assume approximately $48 million of unvested stock options and restricted shares held by SandForce employees. The transaction is expected to close early in the first quarter of 2012 subject to customary closing conditions and regulatory approvals.

Subsequent Events

9 Months Ended

Oct. 02, 2011

Note 16 — Subsequent Events

On October 26, 2011, the Company entered into a definitive agreement to acquire SandForce, Inc. (“SandForce”), a leading provider of flash storage processors for enterprise and client flash solutions and solid state drives. The acquisition is expected to enhance LSI’s position in storage technology solutions.

Under the agreement, LSI will pay approximately $322 million in cash, net of cash acquired, and assume approximately $48 million of unvested stock options and restricted shares held by SandForce employees. The transaction is expected to close early in the first quarter of 2012 subject to customary closing conditions and regulatory approvals.