Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 29, 2019	Mar. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Cash and cash equivalents	$ 267,862		$ 259,946
Short-term marketable securities	33,073		25,836
Accounts receivable, net of allowance for doubtful accounts of $822 and $607 at June 29, 2019 and September 30, 2018, respectively	321,426		129,297
Prepaid expenses	69,819		48,997
Other current assets	60,483		169,708
Total current assets	752,663		633,784
Property and equipment, net	107,752		80,613
Goodwill	1,245,084		1,182,457
Acquired intangible assets, net	183,180		200,202
Long-term marketable securities	21,553		30,115
Deferred tax assets	189,371		165,566
Other assets	148,998		36,285
Total assets	2,648,601		2,329,022
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	44,065		53,473
Accrued expenses and other current liabilities	95,790		74,388
Accrued compensation and benefits	78,854		101,784
Accrued income taxes	8,222		18,044
Deferred revenue	374,291		487,590
Total current liabilities	601,222		735,279
Long-term debt	698,916		643,268
Deferred tax liabilities	37,354		5,589
Deferred revenue	8,288		11,852
Other liabilities	87,226		58,445
Total liabilities	1,433,006		1,454,433
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued	0		0
Common stock, $0.01 par value; 500,000 shares authorized; 115,111 and 117,981 shares issued and outstanding at June 29, 2019 and September 30, 2018, respectively	1,151		1,180
Additional paid-in capital	1,504,512		1,558,403
Accumulated deficit	(197,056)		(599,409)
Accumulated other comprehensive loss	(93,012)		(85,585)
Total stockholders’ equity	1,215,595	$ 1,247,708	874,589	$ 834,385	$ 927,724	$ 885,436
Total liabilities and stockholders’ equity	$ 2,648,601		$ 2,329,022