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Income Taxes (Tables)
12 Months Ended
Sep. 30, 2024
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,
 202420232022
United States$430,532 $268,314 $217,323 
International264,933 217,674 168,070 
$695,465 $485,988 $385,393 
Schedule Of Provision For Income Taxes (Benefit)
The provision for income taxes consists of the following (in thousands):
 
 Years Ended September 30,
 202420232022
Current
U.S. federal$99,745 $115,170 $35,259 
State17,957 18,359 14,592 
Foreign79,200 66,053 54,079 
Total196,902 199,582 103,930 
Deferred
U.S. federal(51,968)(89,280)(28,721)
State(11,100)(18,576)(11,332)
Foreign(5,147)(686)(644)
Total(68,215)(108,542)(40,697)
$128,687 $91,040 $63,233 
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,
 202420232022
Income tax provision at statutory rate$146,048 $102,058 $80,933 
State taxes, net of federal benefit10,548 6,806 6,012 
Foreign-derived intangible income deduction(28,036)(30,086)(19,886)
Tax impact of foreign earnings7,359 9,856 (1,549)
Research and development and other credits(14,748)(17,654)(19,763)
Stock-based and other compensation8,145 20,145 15,070 
Other(629)(85)2,416 
$128,687 $91,040 $63,233 
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,
 20242023
Deferred tax assets
Net operating loss carry-forwards$34,787 $40,201 
Capitalized research and development costs337,626 267,744 
Accrued compensation and benefits13,493 11,995 
Stock-based compensation8,606 8,875 
Deferred revenue39,042 42,544 
Lease liabilities53,945 62,405 
Other accruals and reserves28,729 22,723 
Tax credit carryforwards25,052 23,883 
Depreciation1,507 531 
542,787 480,901 
Valuation allowance(39,651)(43,942)
503,136 436,959 
Deferred tax liabilities
Purchased intangibles(53,047)(55,519)
Depreciation(29,441)(28,113)
Deferred costs(10,752)(11,031)
Lease assets(36,610)(41,709)
Other accruals and reserves(14,514)(9,916)
(144,364)(146,288)
Net deferred tax assets$358,772 $290,671 
Schedule of Unrecognized Tax Benefits Roll Forward
The following table provides a reconciliation of the beginning and ending amount of unrecognized tax benefits in fiscal years 2024, 2023 and 2022 (in thousands):
202420232022
Balance, beginning of period$79,167 $66,840 $70,814 
Gross increases related to prior period tax positions7,939 4,270 4,816 
Gross decreases related to prior period tax positions(7,659)(70)(10,538)
Gross increases related to current period tax positions8,494 9,224 10,203 
Decreases relating to settlements with tax authorities(50)(300)— 
Reductions due to lapses of statute of limitations(1,014)(797)(8,455)
Balance, end of period$86,877 $79,167 $66,840