Derivative Financial Instruments (Details) (USD $)	3 Months Ended			9 Months Ended
	Jul. 03, 2011	Jan. 02, 2011 volumeItemType	Jun. 27, 2010 volumeItemType	Jul. 03, 2011	Jun. 27, 2010	Jul. 03, 2011 Quoted Prices In Active Markets For Identical Instruments (Level 1) Interest Rate Swap	Oct. 03, 2010 Quoted Prices In Active Markets For Identical Instruments (Level 1) Interest Rate Swap	Jul. 03, 2011 Quoted Prices In Active Markets For Identical Instruments (Level 1) Net Purchase Options	Jul. 03, 2011 Significant Other Observable Inputs (Level 2) Interest Rate Swap	Oct. 03, 2010 Significant Other Observable Inputs (Level 2) Interest Rate Swap	Jul. 03, 2011 Significant Other Observable Inputs (Level 2) Net Purchase Options	Jul. 03, 2011 Significant Unobservable Inputs (Level 3) Interest Rate Swap	Oct. 03, 2010 Significant Unobservable Inputs (Level 3) Interest Rate Swap	Jul. 03, 2011 Significant Unobservable Inputs (Level 3) Net Purchase Options	Jul. 03, 2011 Carrying (Reported) Amount, Fair Value Disclosure Interest Rate Swap	Oct. 03, 2010 Carrying (Reported) Amount, Fair Value Disclosure Interest Rate Swap	Jul. 03, 2011 Carrying (Reported) Amount, Fair Value Disclosure Net Purchase Options
Fair Value Measurement
Cash Flow Hedges Derivative Instruments at Fair Value									$ (888)	$ (1,654)	$ 227				$ (888)	$ (1,654)	$ 227
Interest Rate Cash Flow Hedges [Abstract]
Description of Types of Interest Rate Cash Flow Hedging Instruments Used				Interest rate swap agreement
Number of Interest Rate Derivatives Held	2			2
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge				3 years
Interest Rate Derivatives, aggregate notional amount	80,000,000			80,000,000
Term loan	80,000,000			80,000,000
Stated Fixed rate of interest on first half of term loan				1.81%
Stated Fixed rate of interest on second half of term loan				1.80%
Payment of Term loan at interest rate of 1.81%				40,000,000
Payment of Term loan at interest rate of 1.80%				40,000,000
Price Risk Cash Flow Hedges [Abstract]
Description of Types of Price Risk Cash Flow Hedging Instruments Used		purchased call options and written put options	purchased call options and written put options
Hedge quantity of fuel purchases, One (in gallons)		1,092,000	168,000
Minimum Effective Purchase Price for Option derivative, One (per gallon)		1.95	2.09
Maximum Effective Purchase Price for Option derivative, One (per gallon)		2.56	2.60
Hedge Quantity of Fuel Purchases, Two (in gallons)			588,000
Minimum Effective Purchase Price for Option derivative, Two (per gallon)			2.12
Maximum Effective Purchase Price for Option derivative, Two (per gallon)			2.60
Maturity of Option Derivatives		Apr. 30, 2011	Oct. 30, 2010
Unrealized gain (loss) recognized in other comprehensive income	$ (292,000)		$ (358,000)	$ (895,000)	$ 964,000