Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Mar. 30, 2013	Mar. 24, 2012
Operating activities:
Net earnings	$ 22,886,000	$ 15,908,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation of fixed assets	13,864,000	12,712,000
Amortization of intangibles and deferred costs	2,388,000	2,393,000
Share-based compensation	916,000	569,000
Deferred income taxes	(86,000)	(74,000)
Other	(63,000)	(109,000)
Changes in assets and liabilities net of effects from purchase of companies
(Increase)decrease in accounts receivable	(2,797,000)	2,114,000
Increase in inventories	(5,090,000)	(5,467,000)
(Increase) decrease in prepaid expenses	(920,000)	279,000
(Decrease)increase in accounts payable and accrued liabilities	(2,543,000)	1,733,000
Net cash provided by operating activities	28,555,000	30,058,000
Investing activities:
Purchases of property, plant and equipment	(15,557,000)	(21,071,000)
Purchases of marketable securities	(83,342,000)	(62,450,000)
Proceeds from redemption of marketable securities	23,478,000	60,023,000
Proceeds from disposal of property and equipment	493,000	404,000
Other	(36,000)	(926,000)
Net cash used in investing activities	(74,964,000)	(24,020,000)
Financing activities:
Payments to repurchase common stock	(2,763,000)	0
Proceeds from issuance of stock	2,576,000	2,471,000
Payments on capitalized lease obligations	(177,000)	(139,000)
Payment of cash dividend	(5,449,000)	(4,640,000)
Net cash used in financing activities	(5,813,000)	(2,308,000)
Effect of exchange rate on cash and cash equivalents	362,000	459,000
Net (decrease) increase in cash and cash equivalents	(51,860,000)	4,189,000
Cash and cash equivalents at beginning of period	154,198,000	87,479,000
Cash and cash equivalents at end of period	$ 102,338,000	$ 91,668,000