Income Taxes (Tables)

12 Months Ended

Sep. 30, 2020

Income Tax Disclosure [Abstract]

Components Of Income Before Income Taxes

The United States and international components of income before income taxes are as follows (in thousands):

	Years Ended September 30,
	2020		2019		2018
United States	$	216,409	$	360,648	$	441,336
International	179,988		180,463		162,424
	$	396,397	$	541,111	$	603,760

Schedule Of Provision For Income Taxes (Benefit)

The provision for income taxes consists of the following (in thousands):

	Years Ended September 30,
	2020		2019		2018
Current
U.S. federal	$	26,978	$	43,039	$	78,454
State	4,230		13,864		9,800
Foreign	50,368		49,197		41,040
Total	81,576		106,100		129,294
Deferred
U.S. federal	10,875		8,716		21,259
State	(1,121)		1,617		725
Foreign	(2,374)		(3,056)		(1,207)
Total	7,380		7,277		20,777
	$	88,956	$	113,377	$	150,071

Schedule Of Effective Tax Rate Differs From The U.S. Federal Statutory Rate

The effective tax rate differs from the U.S. federal statutory rate as follows (in thousands):

	Years Ended September 30,
	2020		2019		2018
Income tax provision at statutory rate	$	83,243	$	113,633	$	147,921
State taxes, net of federal benefit	4,258		14,206		9,349
Tax impact of foreign operations	(7,693)		(9,161)		(6,696)
Research and development and other credits	(11,843)		(12,760)		(13,159)
Domestic manufacturing deduction	—		—		(9,722)
Stock-based and other compensation	18,002		6,771		(150)
Transition impacts of the Tax Cuts and Jobs Act	—		—		21,015
Other	2,989		688		1,513
	$	88,956	$	113,377	$	150,071

Schedule Of Tax Effects To Deferred Tax Assets And Liabilities

The tax effects of the temporary differences that give rise to the deferred tax assets and liabilities are as follows (in thousands):

	Years Ended September 30,
	2020		2019
Deferred tax assets
Net operating loss carry-forwards	$	54,842	$	12,269
Accrued compensation and benefits	13,162		13,478
Stock-based compensation	13,010		7,144
Deferred revenue	40,577		35,247
Lease liabilities	19,656		17,313
Other accruals and reserves	17,384		15,786
Tax credit carryforwards	15,807		13,783
Depreciation	620		592
	175,058		115,612
Valuation allowance	(32,587)		(23,495)
	142,471		92,117
Deferred tax liabilities
Purchased intangibles	(46,491)		(10,560)
Depreciation	(34,757)		(39,910)
Deferred costs	(11,924)		(10,656)
Other accruals and reserves	(4,728)		(3,603)
	(97,900)		(64,729)
Net deferred tax assets	$	44,571	$	27,388

Schedule Of Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits

The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits in fiscal years 2020, 2019 and 2018 (in thousands):

	2020		2019		2018
Balance, beginning of period	$	42,287	$	31,672	$	23,135
Gross increases related to prior period tax positions	8,664		5,129		2,715
Gross decreases related to prior period tax positions	(1,051)		(287)		—
Gross increases related to current period tax positions	9,272		7,756		8,230
Decreases relating to settlements with tax authorities	(3,578)		—		—
Reductions due to lapses of statute of limitations	(3,827)		(1,983)		(2,408)
Balance, end of period	$	51,767	$	42,287	$	31,672