CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Document Period End Date	Mar. 31, 2019
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (3,050)	$ (119,676)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	83,305	94,245
Stock-based compensation	64,211	67,967
Non-cash interest expense	24,686	25,195
Deferred tax benefit	(12,815)	(90,143)
Loss on extinguishment of debt	910	0
Goodwill and Intangible Asset Impairment	0	137,907
Impairment of fixed asset	0	1,780
Other	805	579
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	24,914	(19,815)
Prepaid expenses and other assets	(20,033)	(22,381)
Accounts payable	3,240	(2,579)
Accrued expenses and other liabilities	(7,985)	4,196
Deferred revenue	41,013	88,460
Net Cash Provided by (Used in) Continuing Operations	199,201	165,735
Cash Provided by (Used in) Operating Activities, Discontinued Operations	4,355	29,630
Net cash provided by operating activities	203,556	195,365
Proceeds from Divestiture of Businesses	404,045	0
Cash flows from investing activities:
Capital expenditures	(23,434)	(25,326)
Payments for business and asset acquisitions, net of cash acquired	(2,553)	(12,768)
Purchases of marketable securities and other investments	(119,165)	(92,994)
Proceeds from sales and maturities of marketable securities and other investments	117,661	195,273
Net cash provided by investing activities	376,554	64,185
Cash flows from financing activities:
Repayment and redemption of debt	(300,000)	(331,172)
Payments for repurchase of common stock	(91,321)	0
Acquisition payments with extended payment terms	0	(16,927)
Proceeds from issuance of common stock from employee stock plans	8,643	9,360
Payments for taxes related to net share settlement of equity awards	(38,191)	(44,006)
Other financing activities	(1,210)	(647)
Net cash used in financing activities	(422,079)	(383,392)
Effects of exchange rate changes on cash and cash equivalents	782	185
Net increase (decrease) in cash and cash equivalents	158,813	(123,657)
Cash and cash equivalents at beginning of period	315,963	592,299
Cash and cash equivalents at end of period	$ 474,776	$ 468,642