Debt (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended		9 Months Ended
	Oct. 27, 2012	Nov. 18, 2013 Renewal of Line of Credit [Member]	Nov. 16, 2012 Renewal of Line of Credit [Member]	Oct. 27, 2012 August 2011 Facility [Member]	Oct. 27, 2012 November 2011 Facility [Member]
Line of Credit Facility [Line Items]
Number of unsecured credit facilities	2
Expiration date of renewed facility		November 18, 2013		August 2013	November 2012
Maximum borrowing capacity under renewed facility			$ 50.0	$ 30.0	$ 50.0
Interest rate under renewed facility		prime plus 2%		higher of prime rate, the federal funds rate plus 0.5% or LIBOR	prime plus 2%
Available borrowings under credit facilities	80.0
Debt outstanding at period end	0
Subsequent Event [Line Items]
Maximum borrowing capacity under renewed facility			$ 50.0	$ 30.0	$ 50.0
Interest rate under renewed facility		prime plus 2%		higher of prime rate, the federal funds rate plus 0.5% or LIBOR	prime plus 2%
Expiration date of renewed facility		November 18, 2013		August 2013	November 2012