Note 8 - Pension Plans - Allocation of Benefit Plan Assets (Details) - Pension Plan [Member]	Sep. 26, 2021	Sep. 27, 2020
Defined Benefit Plan, Equity Securities [Member]
Asset Percentage, Policy Allocation	50.00%
Asset Percentage, Actual Allocation	50.00%	48.00%
Defined Benefit Plan, Equity Securities [Member] | Buffalo News [Member]
Asset Percentage, Policy Allocation	30.00%
Asset Percentage, Actual Allocation	31.00%	92.00%
Defined Benefit Plan, Debt Security [Member]
Asset Percentage, Policy Allocation	35.00%
Asset Percentage, Actual Allocation	34.00%	33.00%
Defined Benefit Plan, Debt Security [Member] | Buffalo News [Member]
Asset Percentage, Policy Allocation	70.00%
Asset Percentage, Actual Allocation	68.00%	2.00%
US Treasury Securities [Member]
Asset Percentage, Policy Allocation	5.00%
Asset Percentage, Actual Allocation	4.00%	5.00%
US Treasury Securities [Member] | Buffalo News [Member]
Asset Percentage, Policy Allocation	0.00%
Asset Percentage, Actual Allocation	0.00%	0.00%
Hedge Funds [Member]
Asset Percentage, Policy Allocation	10.00%
Asset Percentage, Actual Allocation	11.00%	10.00%
Hedge Funds [Member] | Buffalo News [Member]
Asset Percentage, Policy Allocation	0.00%
Asset Percentage, Actual Allocation	0.00%	0.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Asset Percentage, Policy Allocation	0.00%
Asset Percentage, Actual Allocation	1.00%	4.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Buffalo News [Member]
Asset Percentage, Policy Allocation	0.00%
Asset Percentage, Actual Allocation	1.00%	6.00%