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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Operating activities:    
Net earnings $ 12,426,000 $ 10,226,000
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of fixed assets 7,688,000 6,790,000
Amortization of intangibles and deferred costs 1,252,000 1,197,000
Share-based compensation 524,000 507,000
Deferred income taxes (59,000) 15,000
Loss on sale of marketable securities 260,000  
Other (93,000) (2,000)
Changes in assets and liabilities net of effects from purchase of companies    
Decrease in accounts receivable 12,906,000 9,787,000
Increase in inventories (5,140,000) (6,994,000)
Increase in prepaid expenses (358,000) (483,000)
Increase (decrease) in accounts payable and accrued liabilities 1,872,000 (3,781,000)
Net cash provided by operating activities 31,278,000 17,262,000
Investing activities:    
Payment for purchases of of companies, net of cash acquired (11,000,000)  
Purchases of property, plant and equipment (9,317,000) (7,481,000)
Purchases of marketable securities (5,240,000) (80,002,000)
Proceeds from redemption and sales of marketable securities 5,495,000 240,000
Proceeds from disposal of property and equipment 360,000 261,000
Other (109,000) (37,000)
Net cash used in investing activities (19,811,000) (87,019,000)
Financing activities:    
Payments to repurchase common stock   (2,763,000)
Proceeds from issuance of stock 120,000 1,700,000
Payments on capitalized lease obligations (124,000) (88,000)
Payment of cash dividend (2,988,000) (3,004,000)
Net cash used in financing activities (2,992,000) (4,155,000)
Effect of exchange rate on cash and cash equivalents (71,000) (70,000)
Net increase (decrease) in cash and cash equivalents 8,404,000 (73,982,000)
Cash and cash equivalents at beginning of period 97,345,000 154,198,000
Cash and cash equivalents at end of period $ 105,749,000 $ 80,216,000