Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Sep. 27, 2014		18,377
Balance at Sep. 27, 2014		$ 18,377	$ 58,867	$ 103,429	$ (1,790)	$ 178,883
Net earnings				21,710		21,710
Other comprehensive loss	[1]				(356)	$ (356)
Stock options exercised (in shares)		24				27
Stock options exercised		$ 24	176			$ 200
Vesting of restricted stock units (in shares)		65
Vesting of restricted stock units		$ 65	(65)
Compensation expense associated with stock-based plans			2,298			2,298
Excess tax benefits from stock-based compensation			169			169
Restricted stock units and stock options surrendered for withholding taxes payable			(478)			(478)
Cash dividends declared				(2,211)		(2,211)
Balance (in shares) at Oct. 03, 2015		18,466
Balance at Oct. 03, 2015		$ 18,466	60,967	122,928	(2,146)	200,215
Net earnings				37,245		37,245
Other comprehensive loss	[1]				605	$ 605
Stock options exercised (in shares)		463				651
Stock options exercised		$ 463	4,602			$ 5,065
Vesting of restricted stock units (in shares)		47
Vesting of restricted stock units		$ 47	(47)
Compensation expense associated with stock-based plans			2,439			2,439
Excess tax benefits from stock-based compensation			1,717			1,717
Restricted stock units and stock options surrendered for withholding taxes payable			(1,861)			(1,861)
Cash dividends declared				(20,859)		(20,859)
Balance (in shares) at Oct. 01, 2016		18,976
Balance at Oct. 01, 2016		$ 18,976	67,817	139,314	(1,541)	224,566
Net earnings				22,548		22,548
Other comprehensive loss	[1]				208	$ 208
Stock options exercised (in shares)		26				67
Stock options exercised		$ 26	81			$ 107
Vesting of restricted stock units (in shares)		39
Vesting of restricted stock units		$ 39	(39)
Compensation expense associated with stock-based plans			2,245			2,245
Excess tax benefits from stock-based compensation			537			537
Restricted stock units and stock options surrendered for withholding taxes payable			(824)			(824)
Cash dividends declared				(26,011)		(26,011)
Balance (in shares) at Sep. 30, 2017		19,041
Balance at Sep. 30, 2017		$ 19,041	$ 69,817	$ 135,851	$ (1,333)	$ 223,376

[1] Activity within accumulated other comprehensive income (loss) is reported net of related income taxes: 2015 $218, 2016 ($370) and 2017 $(127).