Debt, Capital Lease Obligations And Other Financing (Narrative) (Details) (USD $)	0 Months Ended		1 Months Ended		12 Months Ended
	Apr. 21, 2011	Apr. 08, 2011	Feb. 28, 2010	Apr. 04, 2008	Oct. 01, 2011	Oct. 02, 2010	Oct. 03, 2009	Jun. 15, 2011
Cash payment in due of termination of capital lease obligation and acquisition of property			$ 3,900,000
Possible additional credit facility				100,000,000
Credit facility outstanding at end of period					97,500,000	112,500,000
Average outstanding revolving borrowings					6,600,000	0
Revolving loans borrowing amount				200,000,000
LIBOR rate plus					1.50%
Rate of current fee					0.375%
Amortization of origination fees and expenses in years	7	7			5
Beginning date of repayment					June 30, 2008
Ending date of repayment					April 4, 2013
Interest expense					700,000	700,000	700,000
Senior notes, principal amount	175,000,000
Debt instrument maturity date	June 15, 2018
Issuance of principal amount of senior notes	100,000,000							75,000,000
Effective interest rate on the notes after the treasury rate lock agreement					4.97%
Cash paid for interest					8,600,000	9,200,000	10,500,000
Minimum [Member]
LIBOR rate plus					1.00%
Term Loans [Member]
Credit facility				150,000,000
LIBOR rate plus					1.50%
Principal repayments of term loan					3,750,000
Balloon repayment					75,000,000
Revolving Loans [Member]
Revolving loans borrowing amount				100,000,000
Credit Facility [Member]
Origination fees and expenses					1,300,000
Note Purchase Agreement [Member]
Origination fees and expenses	$ 900,000
Senior Notes [Member]
Debt instrument interest rate	5.20%				5.20%