Consolidated Statements Of Operations - USD ($) shares in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 1,255,631,000	$ 1,241,824,000	$ 1,164,039,000
Cost of revenue:
Cost of revenue	325,378,000	326,502,000	328,502,000
Gross margin	930,253,000	915,322,000	835,537,000
Operating expenses:
Sales and marketing	417,449,000	414,764,000	372,702,000
Research and development	246,888,000	249,786,000	236,028,000
General and administrative	127,919,000	143,045,000	144,991,000
Amortization of acquired intangible assets	23,841,000	31,350,000	32,108,000
Restructuring and other charges, net	51,114,000	3,764,000	7,942,000
Total operating expenses	867,211,000	842,709,000	793,771,000
Operating income	63,042,000	72,613,000	41,766,000
Interest expense	(43,047,000)	(41,673,000)	(42,400,000)
Other income (expense), net	305,000	(2,284,000)	(772,000)
Income before income taxes	20,300,000	28,656,000	(1,406,000)
Provision (benefit) for income taxes	47,760,000	(23,331,000)	(7,645,000)
Net income (loss)	$ (27,460,000)	$ 51,987,000	$ 6,239,000
Earnings (loss) per share—Basic (in USD per share)	$ (0.23)	$ 0.45	$ 0.05
Earnings (loss) per share—Diluted (in USD per share)	$ (0.23)	$ 0.44	$ 0.05
Weighted average shares outstanding—Basic (in shares)	117,724	116,390	115,523
Weighted average shares outstanding—Diluted (in shares)	117,724	118,158	117,356
Software
Revenue:
Revenue	$ 1,088,100,000	$ 1,088,487,000	$ 987,316,000
Cost of revenue:
Cost of revenue	185,414,000	182,843,000	177,772,000
License
Revenue:
Revenue	324,400,000	529,265,000	356,326,000
Cost of revenue:
Cost of revenue	51,936,000	47,737,000	66,841,000
Support and cloud services
Revenue:
Revenue	763,700,000	559,222,000	630,990,000
Cost of revenue:
Cost of revenue	133,478,000	135,106,000	110,931,000
Professional services
Revenue:
Revenue	167,531,000	153,337,000	176,723,000
Cost of revenue:
Cost of revenue	$ 139,964,000	$ 143,659,000	$ 150,730,000