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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 24, 2012
Mar. 26, 2011
Operating activities:    
Net earnings $ 15,908 $ 15,753
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of fixed assets 12,712 12,362
Amortization of intangibles and deferred costs 2,393 2,779
Share-based compensation 569 511
Deferred income taxes (74) (36)
Other (109) 6
Changes in assets and liabilities net of effects from purchase of companies    
Decrease in accounts receivable 2,114 5,504
Increase in inventories (5,467) (6,739)
Decrease in prepaid expenses 279 3,291
Increase (decrease) in accounts payable and accrued liabilities 1,733 (3,969)
Net cash provided by operating activities 30,058 29,462
Purchases of property, plant and equipment (21,071) (10,617)
Purchases of marketable securities (62,450) (20,293)
Proceeds from redemption of marketable securities 60,023 25,525
Proceeds from disposal of property and equipment 404 161
Other (926) (514)
Net cash used in investing activities (24,020) (5,738)
Financing activities:    
Proceeds from issuance of stock 2,471 2,100
Payments on capitalized lease obligations (139) (120)
Payment of cash dividend (4,640) (4,164)
Net cash used in financing activities (2,308) (2,184)
Effect of exchange rate on cash and cash equivalents 459 231
Net increase in cash and cash equivalents 4,189 21,771
Cash and cash equivalents at beginning of period 87,479 74,665
Cash and cash equivalents at end of period $ 91,668 $ 96,436