Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	32 Months Ended
	Jun. 30, 2018 USD ($) Segment	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jul. 01, 2017 USD ($)	Sep. 30, 2017 Segment	Jun. 30, 2018 USD ($)
Number of operating segments | Segment			2		3
Number of reportable segments | Segment	2				3
Revenue	$ 314,777	$ 291,293	$ 929,303	$ 857,660
Operating Costs	81,556	82,268	248,145	246,213
Gross margin	233,221	209,025	681,158	611,447
Sales and marketing	107,741	93,101	305,386	271,568
General and administrative	33,082	35,294	101,439	108,789
Restructuring and other charges, net	1,627	1,551	1,846	8,300		$ 84,500
Amortization of acquired intangible assets	7,850	7,973	23,566	23,986
Operating income	21,703	11,256	61,540	23,330
Interest expense	(10,646)	(10,200)	(31,072)	(32,239)
Interest income and other expense, net	1,086	357	2,481	(2,049)
Income (loss) before income taxes	9,971	699	27,987	(6,860)
Operating Segments
Revenue	314,777	291,293	929,303	857,660
Operating Costs	130,367	129,913	398,051	383,877
Gross margin	184,410	161,380	531,252	473,783
Operating Segments | Software Products
Revenue	273,619	247,635	801,262	722,724
Operating Costs	96,422	94,325	293,417	273,196
Gross margin	177,197	153,310	507,845	449,528
Operating Segments | Professional Services
Revenue	41,158	43,658	128,041	134,936
Operating Costs	33,945	35,588	104,634	110,681
Gross margin	7,213	8,070	23,407	24,255
Unallocated
Sales and marketing	102,831	89,805	290,559	260,521
General and administrative	25,458	27,263	80,272	81,270
Restructuring and other charges, net	1,627	1,551	1,846	8,300
Amortization of acquired intangible assets	14,648	14,490	43,595	43,280
Stock-based compensation	16,658	16,574	52,015	56,139
Other unallocated operating expenses	$ 1,485	$ 441	$ 1,425	$ 943