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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Dec. 24, 2016
Dec. 26, 2015
Operating activities:    
Net earnings $ 13,540,000 $ 12,978,000
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of fixed assets 8,728,000 8,170,000
Amortization of intangibles and deferred costs 1,183,000 1,455,000
Share-based compensation 748,000 518,000
Deferred income taxes (74,000) (36,000)
Loss on sale of marketable securities 109,000
Other 222,000 89,000
Changes in assets and liabilities net of effects from purchase of companies    
Decrease in accounts receivable 5,849,000 10,527,000
Increase in inventories (6,727,000) (12,073,000)
Decrease in prepaid expenses 5,747,000 3,141,000
Decrease in accounts payable and accrued liabilities (2,816,000) (3,960,000)
Net cash provided by operating activities 26,400,000 20,918,000
Investing activities:    
Purchases of property, plant and equipment (11,399,000) (13,304,000)
Purchases of marketable securities (8,550,000) (21,329,000)
Proceeds from redemption and sales of marketable securities 475,000 1,198,000
Proceeds from disposal of property and equipment 645,000 581,000
Other (20,000) (72,000)
Net cash used in investing activities (18,849,000) (32,926,000)
Financing activities:    
Payments to repurchase common stock (3,115,000)
Proceeds from issuance of stock 980,000 640,000
Payments on capitalized lease obligations (90,000) (67,000)
Payment of cash dividend (7,280,000) (6,723,000)
Net cash used in financing activities (6,390,000) (9,265,000)
Effect of exchange rate on cash and cash equivalents (847,000) (494,000)
Net increase (decrease) in cash and cash equivalents 314,000 (21,767,000)
Cash and cash equivalents at beginning of period 140,652,000 133,689,000
Cash and cash equivalents at end of period $ 140,966,000 $ 111,922,000