CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (57,736)	$ (19,111)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	116,644	115,826
Stock-based compensation	79,478	80,511
Non-cash interest expense	26,771	21,215
Deferred tax provision	5,643	3,738
Loss on extinguishment of debt	(18,565)	(4,851)
Other	13,286	(135)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(1,431)	22,110
Prepaid expenses and other assets	(12,295)	(16,765)
Accounts payable	(1,000)	2,697
Accrued expenses and other liabilities	(10,579)	7,334
Deferred revenue	72,988	78,792
Net cash provided by operating activities	250,334	301,063
Cash flows from investing activities:
Capital expenditures	(18,787)	(32,235)
Payments for business and asset acquisitions, net of cash acquired	(72,990)	(27,399)
Purchase of marketable securities and other investments	(153,851)	(32,757)
Proceeds from sales and maturities of marketable securities and other investments	69,658	32,681
Net cash used in investing activities	(175,970)	(59,710)
Cash flows from financing activities:
Payments of debt	(634,055)	(511,844)
Proceeds from Issuance of Long-term Debt	838,959	663,757
Payments for repurchase of common stock	(99,077)	(574,338)
Payments of other long-term liabilities	(206)	(1,084)
Proceeds from issuance of common stock from employee stock plans	8,598	8,440
Cash used to net share settle employee equity awards	(43,353)	(56,973)
Net cash provided by (used in) financing activities	70,866	(472,042)
Effects of exchange rate changes on cash and cash equivalents	(1,210)	1,930
Net increase (decrease) in cash and cash equivalents	144,020	(228,759)
Cash and cash equivalents at beginning of period	481,620	479,449
Cash and cash equivalents at end of period	$ 625,640	$ 250,690