Direct Customers and/or Distributors Accounted for Ten Percent or More of Total Accounts Receivable (Detail)	3 Months Ended	12 Months Ended
	Dec. 28, 2012	Sep. 28, 2012
Customer A
Revenue, Major Customer [Line Items]
Direct customers and/or distributors accounted for 10% or more of total accounts receivable	28.00%	20.00%
Customer B
Revenue, Major Customer [Line Items]
Direct customers and/or distributors accounted for 10% or more of total accounts receivable	16.00%	19.00%