Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Cash flows from operating activities:
Net income	$ 33,206	$ 42,836
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,506	9,717
Amortization of intangible assets	3,247	4,352
Deferred income taxes	91	8,179
Tax benefit from employee stock options	1,519	248
Loss on disposal of property and equipment	212	567
Stock-based compensation	8,183	6,084
Excess tax benefit from stock-based compensation arrangements	(2,593)	(3,247)
Non-cash translation adjustment related to Finland dissolution	0	(6,511)
Other non-cash (income) expense	(112)	0
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	11,686	(20,894)
Inventories	(4,961)	(21,874)
Prepaid expenses and other assets	(10,079)	(14,515)
Other assets	654	(3,453)
Accounts payable	(1,314)	5,072
Income taxes payable/receivable	(19,887)	6,016
Other current liabilities	1,479	20,858
Other long-term liabilities	(91)	2,409
Net cash provided by operating activities	32,746	35,844
Cash flows from investing activities:
Purchases of property and equipment	(19,575)	(16,242)
Proceeds from dispositions of property and equipment	0	33
Purchases of available-for-sale securities	(146,499)	(101,378)
Proceeds from sales and maturities of available-for-sale securities	70,870	48,309
Acquisition of businesses, net of cash acquired	0	(14,589)
Net cash used in investing activities	(95,204)	(83,867)
Cash flows from financing activities:
Short-term borrowings	9,262	864
Repayments of short-term borrowing	(9,262)	(864)
Net change in capital lease obligations	(7)	(10)
Issuance of common stock under employee stock option and purchase plans	7,720	25,969
Repurchase of common stock	(20,665)	(27,397)
Net settlement of restricted common stock	(4,431)	(3,189)
Excess tax benefits from stock-based compensation arrangements	2,593	3,247
Net cash provided by (used in) financing activities	(14,790)	(1,380)
Effect of exchange rate changes on cash and cash equivalents	(3,749)	4,140
Net increase (decrease) in cash and cash equivalents	(80,997)	(45,263)
Cash and cash equivalents, beginning of period	167,061	245,380
Cash and cash equivalents, end of period	86,064	200,117
Cash paid during the period for:
Interest	7	13
Income taxes	42,787	11,431
Cash received during the period for:
Income taxes	10,054	5,387
Non-cash investing and financing activities:
Unpaid property and equipment	$ 3,777	$ 2,828