CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 213,810	$ (159,928)	$ (150,996)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	114,338	(184,904)	(178,341)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of intangible assets	103,563	124,883	150,731
Depreciation	55,227	60,355	53,268
Stock-based compensation	141,212	142,909	142,901
Non-cash interest expense	49,488	49,091	59,295
Deferred tax (benefit) provision	(123,763)	(86,841)	5,226
Loss on extinguishment of debt	910	(348)	18,565
Impairment of goodwill and other intangible assets	0	170,941	0
Other Asset Impairment Charges	0	10,550	16,351
Other	4,462	2,230	8,403
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	1,058	16,996	(15,403)
Prepaid expenses and other assets	(25,076)	(20,555)	(14,858)
Accounts payable	22,922	(14,458)	109
Accrued expenses and other liabilities	30,344	24,451	3,557
Deferred revenue	22,317	96,977	51,041
Net cash provided by operating activities	401,357	444,426	378,867
Net Cash Provided by (Used in) Continuing Operations	397,002	392,277	300,845
Cash Provided by (Used in) Operating Activities, Discontinued Operations	4,355	52,149	78,022
Cash flows from investing activities:
Capital expenditures	(44,185)	(48,845)	(61,835)
Proceeds from Divestiture of Businesses	407,043	0	0
Payments for business and technology acquisitions, net of cash acquired	(20,873)	(110,170)	(113,769)
Purchases of marketable securities and other investments	(349,125)	(201,995)	(332,470)
Proceeds from sales and maturities of marketable securities and other investments	303,171	323,695	173,864
Net cash used in investing activities	296,031	(37,315)	(334,210)
Cash flows from financing activities:
Payments of long-term debt	(300,000)	(481,172)	(634,055)
Proceeds from long-term debt, net of issuance costs	0	0	837,482
Payments for repurchase of common stock	(126,938)	(136,090)	(99,077)
Payment for Contingent Consideration Liability, Financing Activities	0	(24,842)	0
Payments on other long-term liabilities	(2,131)	(1,232)	(583)
Proceeds from issuance of common stock from employee stock plans	16,597	18,384	17,383
Cash used to net share settle employee equity awards	(49,428)	(55,396)	(54,099)
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	9,863	0	0
Net cash provided by financing activities	(452,037)	(680,348)	67,051
Effects of exchange rate changes on cash and cash equivalents	(353)	(3,099)	(1,029)
Net increase (decrease) in cash and cash equivalents	244,998	(276,336)	110,679
Cash and cash equivalents at beginning of year	315,963	592,299	481,620
Cash and cash equivalents at end of year	$ 560,961	$ 315,963	$ 592,299