Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Balance at the beginning of the year at Sep. 28, 2013	$ 256,537	$ 3,852	$ 0	$ 240,348	$ 12,337
Balance at the beginning of the year ( in shares) at Sep. 28, 2013		15,408
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	35,496			42,009	(6,513)
Exercise of stock options	$ 6,726	$ 46	6,680
Exercise of stock options (in shares)	182	182
Stock-based compensation	$ 6,052	$ 7	6,045
Stock-based compensation (in shares)		31
Tax benefit from equity compensation	1,727		1,727
Issuance for employee stock purchase plan	864	$ 4	860
Issuance for employee stock purchase plan (in shares)		16
Common stock purchased and retired	(31,013)	$ (114)	(9,200)	(21,699)
Common stock purchased and retired (in shares)		(457)
Dividends, $1.20 per share	(18,262)			(18,262)
Balance at the end of the year at Sep. 27, 2014	258,127	$ 3,795	6,112	242,396	5,824
Balance at the end of the year (in shares) at Sep. 27, 2014		15,180
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	34,061			45,462	(11,401)
Exercise of stock options	$ 3,927	$ 23	3,904
Exercise of stock options (in shares)	92	92
Stock-based compensation	$ 7,457	$ 14	7,443
Stock-based compensation (in shares)		57
Tax benefit from equity compensation	734		734
Issuance for employee stock purchase plan	920	$ 4	916
Issuance for employee stock purchase plan (in shares)		16
Common stock purchased and retired	(29,115)	$ (103)	(14,834)	(14,178)
Common stock purchased and retired (in shares)		(413)
Dividends, $1.20 per share	(17,969)			(17,969)
Balance at the end of the year at Oct. 03, 2015	258,142	$ 3,733	4,275	255,711	(5,577)
Balance at the end of the year (in shares) at Oct. 03, 2015		14,932
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	22,698			27,494	(4,796)
Issuance of common stock, net of issuance costs	74,301	$ 474	73,827
Issuance of common stock, net of issuance costs (in shares)		1,897
Issuance of tangible equity units, net of issuance costs	84,511		84,511
Adjustments to Additional Paid in Capital, Purchase of Capped Call Transaction	(7,935)		(7,935)
Exercise of stock options	$ 2,799	$ 17	2,782
Exercise of stock options (in shares)	68	68
Stock-based compensation	$ 7,156	$ 12	7,144
Stock-based compensation (in shares)		47
Tax benefit from equity compensation	(172)		(172)
Issuance for employee stock purchase plan	1,048	$ 6	1,042
Issuance for employee stock purchase plan (in shares)		24
Common stock purchased and retired	(18,414)	$ (77)	(10,595)	(7,742)
Common stock purchased and retired (in shares)		(308)
Dividends, $1.20 per share	(18,874)			(18,874)
Balance at the end of the year at Oct. 01, 2016	$ 405,260	$ 4,165	$ 154,879	$ 256,589	$ (10,373)
Balance at the end of the year (in shares) at Oct. 01, 2016		16,660