Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Cash flows from operating activities:
Net income	$ 17,051	$ 19,113
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,828	4,767
Amortization of intangible assets	1,636	2,095
Deferred income taxes	(527)	8,096
Tax benefit from employee stock options	955	1,543
Loss on disposal of property and equipment	42	156
Stock-based compensation	4,022	2,922
Excess tax benefit from stock-based compensation arrangements	(1,681)	(1,678)
Other non-cash (income) expense	154	(58)
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	9,161	1,522
Inventories	2,671	(9,109)
Prepaid expenses and other assets	(7,321)	(2,443)
Other assets	(497)	(2,011)
Accounts payable	(4,715)	2,687
Income taxes payable/receivable	(8,210)	(1,314)
Other current liabilities	(3,110)	1,250
Other long-term liabilities	676	2,431
Net cash provided by operating activities	16,135	29,969
Cash flows from investing activities:
Purchases of property and equipment	(8,139)	(5,129)
Proceeds from dispositions of property and equipment	26	0
Purchases of available-for-sale securities	(12,593)	(71,093)
Proceeds from sales and maturities of available-for-sale securities	30,188	19,506
Changes in restricted cash	0	(68)
Net cash used in investing activities	9,482	(56,784)
Cash flows from financing activities:
Short-term borrowings	4,786	285
Repayments of short-term borrowing	(4,786)	(285)
Net change in capital lease obligations	(4)	(5)
Issuance of common stock under employee stock option and purchase plans	4,568	17,331
Repurchase of common stock	(20,665)	0
Net settlement of restricted common stock	(4,413)	(2,086)
Excess tax benefits from stock-based compensation arrangements	1,681	1,678
Net cash provided by (used in) financing activities	(18,833)	16,918
Effect of exchange rate changes on cash and cash equivalents	(6,183)	(7,968)
Net increase (decrease) in cash and cash equivalents	601	(17,865)
Cash and cash equivalents, beginning of period	167,061	245,380
Cash and cash equivalents, end of period	167,662	227,515
Cash paid during the period for:
Interest	3	11
Income taxes	25,818	3,973
Cash received during the period for:
Income taxes	9,662	3,908
Non-cash investing and financing activities:
Unpaid property and equipment	$ 1,933	$ 889