Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2011	Jan. 01, 2011
Cash flows from operating activities:
Net income	$ 22,123	$ 13,260
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,026	14,069
Stock-based compensation	13,382	11,027
Excess tax benefits from stock-based awards	(150)	(262)
Other non-cash costs, net	101	27
Changes in operating assets and liabilities:
Accounts receivable	13,295	(958)
Accounts payable and accrued expenses	(9,179)	4,585
Accrued compensation and benefits	(23,677)	(33,818)
Deferred revenue	(2,075)	(7,425)
Accrued litigation	0	(52,129)
Accrued income taxes	(2,409)	(2,069)
Other current assets and prepaid expenses	7,884	6,127
Other noncurrent assets and liabilities	164	(472)
Net cash provided (used) by operating activities	36,485	(48,038)
Cash flows from investing activities:
Additions to property and equipment	(7,570)	(5,412)
Acquisitions of businesses	(880)	0
Net cash used by investing activities	(8,450)	(5,412)
Cash flows from financing activities:
Borrowings under revolving credit facility	40,000	0
Repayments of borrowings under revolving credit facility	(40,000)	0
Proceeds from issuance of common stock	7,196	12,232
Excess tax benefits from stock-based awards	150	262
Payments of withholding taxes in connection with vesting of stock-based awards	(12,661)	(17,168)
Net cash used by financing activities	(5,315)	(4,674)
Effect of exchange rate changes on cash and cash equivalents	(3,247)	786
Net increase (decrease) in cash and cash equivalents	19,473	(57,338)
Cash and cash equivalents, beginning of period	167,878	240,253
Cash and cash equivalents, end of period	$ 187,351	$ 182,915

Name:	us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).