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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2022

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,
						2022						2021						2020
United States						$	217,323					$	189,398					$	216,409
International						168,070						197,539						179,988
						$	385,393					$	386,937					$	396,397

Schedule Of Provision For Income Taxes (Benefit)

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

						Years Ended September 30,
						2022						2021						2020
Current
U.S. federal						$	35,259					$	53,107					$	26,978
State						14,592						16,686						4,230
Foreign						54,079						62,832						50,368
Total						103,930						132,625						81,576
Deferred
U.S. federal						(28,721)						(61,739)						10,875
State						(11,332)						(15,294)						(1,121)
Foreign						(644)						104						(2,374)
Total						(40,697)						(76,929)						7,380
						$	63,233					$	55,696					$	88,956

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,
						2022						2021						2020
Income tax provision at statutory rate						$	80,933					$	81,257					$	83,243
State taxes, net of federal benefit						6,012						5,118						4,258
Tax impact of foreign operations						(21,435)						(26,881)						(7,693)
Research and development and other credits						(18,917)						(18,055)						(11,843)
Stock-based and other compensation						15,070						12,740						18,002
Other						1,570						1,517						2,989
						$	63,233					$	55,696					$	88,956

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,
						2022						2021
Deferred tax assets
Net operating loss carry-forwards						$	42,849					$	41,252
Capitalized research and development costs						158,206						95,259
Accrued compensation and benefits						14,068						13,207
Stock-based compensation						10,389						12,829
Deferred revenue						32,244						30,115
Lease liabilities						21,572						23,747
Other accruals and reserves						18,797						18,450
Tax credit carryforwards						28,858						34,187
Depreciation						505						580
						327,488						269,626
Valuation allowance						(46,136)						(40,404)
						281,352						229,222
Deferred tax liabilities
Purchased intangibles						(57,350)						(57,219)
Depreciation						(22,278)						(26,516)
Deferred costs						(12,987)						(13,057)
Other accruals and reserves						(8,153)						(6,651)
						(100,768)						(103,443)
Net deferred tax assets						$	180,584					$	125,779

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 2022, 2021 and 2020 (in thousands):

						2022						2021						2020
Balance, beginning of period						$	70,814					$	51,767					$	42,287
Gross increases related to prior period tax positions						4,816						14,867						8,664
Gross decreases related to prior period tax positions						(10,538)						—						(1,051)
Gross increases related to current period tax positions						10,203						12,595						9,272
Decreases relating to settlements with tax authorities						—						(321)						(3,578)
Reductions due to lapses of statute of limitations						(8,455)						(8,094)						(3,827)
Balance, end of period						$	66,840					$	70,814					$	51,767

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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