CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 46,943	$ 48,616
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,623	23,762
Share-based compensation	11,762	13,235
Deferred income taxes	1,185	689
Tax effect from share-based payment arrangements	(2,338)	(3,966)
Excess tax benefits from share-based payment arrangements	(1,312)	(1,052)
Net amortization of premium on marketable securities	443	1,668
Benefit from provision for doubtful accounts, net	(583)	(234)
Net loss on sales of property and equipment	146	658
Changes in operating assets and liabilities:
Accounts receivable	12,262	(7,852)
Prepaid expenses and other assets	3,869	815
Accounts payable	5,808	24
Accrued compensation and employee benefits	(4,438)	3,453
Other liabilities	6,386	693
Deferred revenue	6,297	3,516
Net cash provided by operating activities	105,053	84,025
Cash flows from investing activities:
Purchases of property and equipment	(8,323)	(12,746)
Cash proceeds from sale of property and equipment		50
Cash proceeds from sale of product line assets		2,182
Purchases of marketable securities	(117,675)	(71,749)
Proceeds from sales of marketable securities	13,644
Proceeds from maturities of marketable securities	54,545	122,573
Distribution from cost method investees	75
Net cash provided by (used in) investing activities	(57,734)	40,310
Cash flows from financing activities:
Payments on revolving line of credit		(50,000)
Payments on Senior Notes	(8,000)
Proceeds from issuances of common stock under employee stock option and purchase plans	7,902	1,981
Dividends paid	(2,389)	(2,772)
Repurchases of common stock	(53,761)	(137,497)
Excess tax benefits from share-based payment arrangements	1,312	1,052
Net cash used in financing activities	(54,936)	(187,236)
Effect of exchange rate changes on cash	2,335	(2,644)
Decrease in cash and cash equivalents	(5,282)	(65,545)
Cash and cash equivalents, beginning of year	146,199	178,157
Cash and cash equivalents, end of year	140,917	112,612
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	9,214	13,374
Cash paid for interest	$ 25,547	$ 20,519