Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
ASSETS
Cash and cash equivalents	$ 224,107	$ 167,878
Accounts receivable, net of allowance for doubtful accounts of $3,313 and $3,902 at March 31, 2012 and September 30, 2011, respectively	204,437	230,220
Prepaid expenses	32,398	30,582
Other current assets	116,190	109,433
Deferred tax assets	54,128	54,151
Total current assets	631,260	592,264
Property and equipment, net	64,021	62,569
Goodwill	616,599	613,394
Acquired intangible assets, net	205,128	222,017
Deferred tax assets	112,092	98,064
Other assets	29,516	41,374
Total assets	1,658,616	1,629,682
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	17,961	16,974
Accrued expenses and other current liabilities	54,187	60,167
Accrued compensation and benefits	88,799	95,980
Accrued income taxes	17,094	11,895
Deferred tax liabilities	1,178	4,440
Deferred revenue	327,313	279,935
Total current liabilities	506,532	469,391
Revolving credit facility	160,000	200,000
Deferred tax liabilities	23,830	25,919
Deferred revenue	14,041	14,389
Other liabilities	96,220	97,293
Total liabilities	800,623	806,992
Commitments and contingencies (Note 12)
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 500,000 shares authorized; 119,487 and 116,937 shares issued and outstanding at March 31, 2012 and September 30, 2011, respectively	1,195	1,169
Additional paid-in capital	1,810,964	1,805,021
Accumulated deficit	(893,043)	(918,736)
Accumulated other comprehensive loss	(61,123)	(64,764)
Total stockholders' equity	857,993	822,690
Total liabilities and stockholders' equity	$ 1,658,616	$ 1,629,682