Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Operating activities:
Net earnings	$ 103,596,000	$ 79,174,000	$ 75,975,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation of fixed assets	42,939,000	38,211,000	34,536,000
Amortization of intangibles and deferred costs	3,538,000	4,234,000	5,587,000
Gains from disposals of property & equipment	(912,000)	(346,000)	(398,000)
Amortization of bond premiums	1,012,000	1,189,000	1,011,000
Share-based compensation	3,858,000	3,048,000	2,375,000
Deferred income taxes	(10,392,000)	7,847,000	7,700,000
Loss (gain) on sale of marketable securities	140,000	(14,000)	661,000
Changes in assets and liabilities, net of effects from purchase of companies:
(Increase) decrease in accounts receivable, net	(7,917,000)	(20,370,000)	3,571,000
Increase in inventories	(9,639,000)	(7,410,000)	(6,295,000)
(Increase) decrease in prepaid expenses and other	(1,120,000)	10,265,000	(7,386,000)
(Decrease) increase in accounts payable and accrued liabilities	(1,736,000)	9,521,000	3,888,000
Net cash provided by operating activities	123,367,000	125,349,000	121,225,000
Investing activities:
Payments for purchases of companies, net of cash acquired		(47,698,000)
Purchases of property, plant and equipment	(60,022,000)	(72,180,000)	(48,709,000)
Purchases of marketable securities	(91,112,000)	(39,923,000)	(41,786,000)
Proceeds from redemption and sales of marketable securities	75,302,000	22,997,000	13,224,000
Proceeds from disposal of property, plant and equipment	2,639,000	1,935,000	2,294,000
Other	54,000	(450,000)	375,000
Net cash used in investing activities	(73,139,000)	(135,319,000)	(74,602,000)
Financing activities:
Payments to repurchase common stock	(2,794,000)	(18,229,000)	(15,265,000)
Proceeds from issuance of common stock	8,894,000	7,231,000	6,570,000
Payments on capitalized lease obligations	(370,000)	(356,000)	(355,000)
Payment of cash dividend	(33,066,000)	(30,859,000)	(28,523,000)
Net cash used in financing activities	(27,336,000)	(42,213,000)	(37,573,000)
Effect of exchange rates on cash and cash equivalents	(2,375,000)	2,493,000	(2,087,000)
Net increase (decrease) in cash and cash equivalents	20,517,000	(49,690,000)	6,963,000
Cash and cash equivalents at beginning of year	90,962,000	140,652,000	133,689,000
Cash and cash equivalents at end of year	$ 111,479,000	$ 90,962,000	$ 140,652,000