CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Document Period End Date	Dec. 31, 2018
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 17,699	$ 47,465
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	42,547	47,833
Stock-based compensation	34,340	36,225
Non-cash interest expense	12,298	13,341
Deferred tax provision (benefit)	(4,755)	(97,132)
Other	312	631
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(21,827)	(40,494)
Prepaid expenses and other assets	(19,811)	(19,001)
Accounts payable	11,437	(11,856)
Accrued expenses and other liabilities	(19,888)	3,045
Deferred revenue	35,253	88,250
Net Cash Provided by (Used in) Continuing Operations	87,605	68,307
Cash Provided by (Used in) Operating Activities, Discontinued Operations	12,286	17,798
Net cash provided by operating activities	99,891	86,105
Cash flows from investing activities:
Capital expenditures	(12,220)	(12,543)
Payments for business and asset acquisitions, net of cash acquired	(1,447)	(8,648)
Purchases of marketable securities and other investments	(47,502)	(32,447)
Proceeds from sales and maturities of marketable securities and other investments	45,678	159,805
Net cash (used in) provided by investing activities	(15,491)	106,167
Cash flows from financing activities:
Repayment and redemption of debt	0	(331,172)
Payments for repurchase of common stock	(75,153)	0
Acquisition payments with extended payment terms	0	(16,880)
Proceeds from issuance of common stock from employee stock plans	0	6
Payments for taxes related to net share settlement of equity awards	(31,651)	(38,617)
Other financing activities	(699)	(65)
Net cash provided by (used in) financing activities	(107,503)	(386,728)
Effects of exchange rate changes on cash and cash equivalents	391	618
Net increase (decrease) in cash and cash equivalents	(22,712)	(193,838)
Cash and cash equivalents at beginning of period	315,963	592,299
Cash and cash equivalents at end of period	$ 293,251	$ 398,461