Note 11 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 215,000
Supplemental Employee Retirement Plan [Member]
Supplemental Retirement Benefit Period (Year)	15 years
Defined Benefit Plan Percent of Highest Average Salary Base	50.00%
Defined Benefit Plan Number of Years in Average Annual Base Salary (Year)	5 years
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation (Year)	10 years
Supplemental Employee Retirement Plan [Member] | Minimum [Member]
Defined Benefit Plan Employment Term (Year)	30 years
Reduced SERP [Member]
Defined Benefit Plan Retirement Age	65
Defined Benefit Plan, Reduction for Each Month	0.0028%
Reduced SERP [Member] | Minimum [Member]
Defined Benefit Plan Employment Term (Year)	10 years
Retirement Savings Plan [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	75.00%
Defined Contribution Plan, Cost	$ 1,300,000	$ 1,200,000	$ 1,100,000
Retirement Savings Plan, First 1% of Employee Contribution [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	1.00%
Retirement Savings Plan, Next 5% of Employee Contribution [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
VEBA [Member]
Defined Contribution Plan, Cost	$ 6,000,000.0	$ 5,800,000	$ 5,100,000
Healthcare Coverage Claims in Excess of	$ 175,000