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Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details) - USD ($)
Sep. 29, 2018
Sep. 30, 2017
Income Taxes [Abstract]    
Property and equipment tax/book differences $ 87,577,000 $ 89,089,000
Property tax method 1,156,000 1,575,000
Total deferred tax liabilities 88,733,000 90,664,000
Insurance reserves 4,790,000 7,872,000
Advance payments on purchases contracts 761,000 1,207,000
Vacation accrual 1,652,000 2,471,000
State tax credits   4,000
Inventory 1,055,000 1,555,000
Deferred compensation 3,662,000 5,032,000
Other 2,352,000 2,605,000
Total deferred tax assets 14,272,000 20,746,000
Net deferred tax liabilities $ 74,461,000 $ 69,918,000