Note 11 - Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended			36 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014	Oct. 01, 2016
Delaware Plan [Member]
Defined Benefit Plan, Contributions by Employer	$ 1,900,000	$ 234,000	$ 240,000
Supplemental Employee Retirement Plan [Member] | Minimum [Member]
Defined Benefit Plan Employment Term	30 years
Supplemental Employee Retirement Plan [Member] | SERPs Supported by Life Insurance Policies [Member]
Defined Benefit Plan, Benefits Paid	$ 25,000	25,000	25,000
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Contributions by Employer	$ 290,000	290,000	290,000
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 Retirement Age	65
Postemployment Benefits, Period Expense	$ 26,000	23,000	16,000
Defined Benefit Plan, Benefits Paid	$ 290,000	290,000	290,000
Reduced SERP [Member] | Minimum [Member]
Defined Benefit Plan Employment Term	10 years
Reduced SERP [Member]
Defined Benefit Plan Retirement Age	65
Defined Benefit Plan, Reduction for Each Month	0.00278%			0.00278%
Retirement Savings Plan [Member] | First 1% of Defined Contribution Plan [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 [Member] | Second 5% of Defined Contribution Plan [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%
Equity Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
Fixed Income Funds [Member]
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
VEBA [Member]
Defined Contribution Plan, Cost Recognized	$ 5,400,000	6,300,000	4,600,000
Healthcare Coverage Claims in Excess of	175,000
Defined Benefit Plan, Future Amortization of Gain (Loss)	174,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent				75.00%
Defined Contribution Plan, Cost Recognized	$ 1,000,000	$ 1,000,000	$ 900,000