Note 10 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ (2,539,000)
Pension Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer			1,919,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement			$ (2,539,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%	3.75%	3.75%
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 262,000	$ 290,000	$ 290,000
Defined Benefit Plan Employment Term	30 years
Supplemental Retirement Benefit Period	15 years
Defined Benefit Plan Percent of Highest Average Salary Base	50.00%
Defined Benefit Plan Number of Years in Average Annual Base Salary	5 years
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation	10 years
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 140,000
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	10 years
Retirement Savings Plan [Member]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	75.00%
Defined Contribution Plan, Cost	$ 1,100,000	1,100,000	1,000,000
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	$ 5,100,000	$ 5,600,000	$ 5,400,000
Healthcare Coverage Claims in Excess of	$ 175,000