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Note A - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended								12 Months Ended
		Sep. 30, 2017 USD ($)	Jun. 24, 2017 USD ($)	Mar. 25, 2017 USD ($)	Dec. 24, 2016 USD ($)	Sep. 24, 2016 USD ($)	Jun. 25, 2016 USD ($)	Mar. 26, 2016 USD ($)	Dec. 26, 2015 USD ($)	Sep. 30, 2017 USD ($) shares	Sep. 24, 2016 USD ($) shares	Sep. 26, 2015 USD ($) shares
Sales Discounts, Returns and Allowances, Goods										$ 13,000,000	$ 14,300,000
Shipping, Handling and Transportation Costs	[1]									81,824,000	73,114,000	$ 74,158,000
Revenue, Net		$ 316,726,000	$ 295,415,000	$ 246,513,000	$ 225,570,000	$ 262,240,000	$ 277,981,000	$ 229,710,000	$ 222,850,000	1,084,224,000	992,781,000	$ 976,256,000
Cash, Uninsured Amount		45,000,000								45,000,000
Cash, FDIC Insured Amount		250,000								250,000
Accounts Receivable, Net		$ 124,553,000				98,325,000				$ 124,553,000	98,325,000
Employees Covered Under Collective Bargaining Agreement, Percentage		28.00%								28.00%
Allowance for Doubtful Accounts Receivable		$ 359,000				571,000				$ 359,000	571,000
Unrecognized Tax Benefits		374,000				354,000				374,000	354,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		239,000				219,000				$ 239,000	$ 219,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares										157,994	180,170	1,500
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense										$ 1,497,000	$ 885,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		4,000,000								$ 4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate										16.60%	16.70%	18.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate										2.00%	1.30%	1.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate										1.30%	1.40%	1.40%
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Expected Forfeiture Rate										13.00%	19.00%	19.00%
Advertising Expense										$ 5,677,000	$ 4,870,000	$ 4,290,000
Commodity Futures Contracts and Spot Commodities, Proprietary Capital Charges		$ 75,000,000								75,000,000
Research and Development Expense										$ 674,000	$ 525,000	$ 506,000
Ten Year Options [Member]
Expected Volatility Term										10 years
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage										42.00%	42.00%	43.00%
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life										3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term										5 years
Minimum [Member] | 5 year options [Member]
Expected Volatility Term										4 years 30 days
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life										20 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term										10 years
Maximum [Member] | 5 year options [Member]
Expected Volatility Term										4 years 90 days
Customer Group One [Member]
Approximate Number of Cusomters		15								15
Customer Group One [Member] | Minimum [Member]
Accounts Receivable, Net		$ 1,000,000								$ 1,000,000
Customer Group One [Member] | Maximum [Member]
Accounts Receivable, Net		10,000,000								$ 10,000,000
Largest Customer [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage										9.00%	8.00%	8.00%
Repair and Maintenance Service [Member]
Revenue, Net										$ 23,204,000	$ 24,571,000	$ 25,534,000
Deferred Revenue		1,956,000				1,671,000				1,956,000	1,671,000
Deferred Revenue, Noncurrent		$ 210,000				$ 145,000				210,000	145,000
Frozen Beverages [Member]
Revenue, Net										263,183,000	253,663,000	236,244,000
Frozen Beverages [Member] | Repair and Maintenance Service [Member]
Revenue, Net										74,594,000	71,123,000	65,765,000
Frozen Beverages [Member] | Machine Sales [Member]
Revenue, Net										$ 23,489,000	$ 24,664,000	$ 25,536,000
[1] Includes share-based compensation expense of $72 for the year ended September 30, 2017, $48 for the year ended September 24, 2016 and $44 for the year ended September 26, 2015.

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