Direct Customers and/or Distributors Accounted for Ten Percent or More of Net Revenue (Detail)	3 Months Ended
Dec. 28, 2012	Dec. 30, 2011
Customer A
Revenue, Major Customer [Line Items]
Direct customers and/or distributors accounted for 10% or more of net revenue	31.00%	21.00%
Customer B
Revenue, Major Customer [Line Items]
Direct customers and/or distributors accounted for 10% or more of net revenue	16.00%	20.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration