XML 24 R43.htm IDEA: XBRL DOCUMENT v2.4.0.6
Activity of Auction Rate Securities, Fair Value Measured using Level Three Inputs (Detail) (USD $)
3 Months Ended 9 Months Ended
Oct. 27, 2012
Jul. 28, 2012
Apr. 28, 2012
Oct. 27, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Carrying value beginning balance     $ 1,722,000 $ 1,722,000
Total gains        
Included in earnings         
Included in other comprehensive income 6,000 (3,000) 5,000 8,000 [1]
Carrying value ending balance $ 1,730,000     $ 1,730,000
[1] Unrealized gains of $5,000 and $6,000 occurred during the first and third quarters of fiscal 2012, respectively, and unrealized losses of $3,000 occurred during the second quarter of fiscal 2012.