Segment Information Schedule of Accounts Receivable by Major Customers (Details)	Jan. 27, 2013	Jan. 29, 2012
Accounts Receivable by Major Customers
Percentage of accounts receivable from significant customers	0.40
Customer A (AR)
Accounts Receivable by Major Customers
Percentage of accounts receivable from significant customers	0.20	0.20
Customer B (AR)
Accounts Receivable by Major Customers
Percentage of accounts receivable from significant customers	0.10	0.00
Customer C (AR)
Accounts Receivable by Major Customers
Percentage of accounts receivable from significant customers	0.10	0.00