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Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details) - USD ($)
Sep. 30, 2017
Sep. 24, 2016
Income Taxes [Abstract]    
Property and equipment tax/book differences $ 89,089,000 $ 88,465,000
Property tax method 1,575,000 1,501,000
Total deferred tax liabilities 90,664,000 89,966,000
Insurance reserves 7,872,000 8,390,000
Advance payments on purchases contracts 1,207,000 618,000
Vacation accrual 2,471,000 2,520,000
State tax credits 4,000 20,000
Inventory 1,555,000 1,720,000
Deferred compensation 5,032,000 4,062,000
Other 2,605,000 1,187,000
Total deferred tax assets 20,746,000 18,517,000
Net deferred tax liabilities $ 69,918,000 $ 71,449,000