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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 29, 2012
Dec. 24, 2011
Operating activities:    
Net earnings $ 10,226,000 $ 5,485,000
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of fixed assets 6,790,000 6,357,000
Amortization of intangibles and deferred costs 1,197,000 1,213,000
Share-based compensation 507,000 294,000
Deferred income taxes 15,000 (85,000)
Other (2,000) (23,000)
Changes in assets and liabilities net of effects from purchase of companies    
Decrease in accounts receivable 9,787,000 19,112,000
Increase in inventories (6,994,000) (2,941,000)
(Increase) decrease in prepaid expenses (483,000) 1,896,000
Decrease in accounts payable and accrued liabilities (3,781,000) (10,640,000)
Net cash provided by operating activities 17,262,000 20,668,000
Investing activities:    
Purchases of property, plant and equipment (7,481,000) (8,869,000)
Purchases of marketable securities (80,002,000) (37,454,000)
Proceeds from redemption of marketable securities 240,000 33,310,000
Proceeds from disposal of property and equipment 261,000 102,000
Other (37,000) (611,000)
Net cash used in investing activities (87,019,000) (13,522,000)
Financing activities:    
Payments to repurchase common stock (2,763,000)  
Proceeds from issuance of stock 1,700,000 1,825,000
Payments on capitalized lease obligations (88,000) (69,000)
Payment of cash dividend (3,004,000) (2,200,000)
Net cash used in financing activities (4,155,000) (444,000)
Effect of exchange rate on cash and cash equivalents (70,000) (90,000)
Net (decrease) increase in cash and cash equivalents (73,982,000) 6,612,000
Cash and cash equivalents at beginning of period 154,198,000 87,479,000
Cash and cash equivalents at end of period $ 80,216,000 $ 94,091,000