Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes was as follows during fiscal 2025, 2024 and 2023: 

	Year ended September 30,
	2025		2024		2023
	(In thousands)
Current:
Federal	$	123,340	$	110,402	$	112,456
State	23,818		10,199		16,844
Foreign	35,977		35,943		42,327
	183,135		156,544		171,627
Deferred:
Federal	(26,949)		(26,227)		(37,884)
State	(3,330)		(1,712)		(15,025)
Foreign	(2,207)		609		5,531
	(32,486)		(27,330)		(47,378)
Total provision	$	150,649	$	129,214	$	124,249

Deferred Tax Assets and Liabilities

Deferred tax assets and liabilities at September 30, 2025 and 2024 were as follows: 

	September 30,
	2025		2024
	(In thousands)
Deferred tax assets:
Loss and credit carryforwards	$	6,876	$	7,717
Compensation benefits	31,638		32,093
Operating lease liabilities	7,375		7,881
Research and development costs	100,304		67,795
Other assets	21,538		18,241
Total deferred tax assets	167,731		133,727
Deferred tax liabilities:
Intangible assets	(8,612)		(7,812)
Deferred commission	(15,134)		(14,484)
Operating lease right-of-use assets	(6,479)		(7,240)
Other liabilities	(18,953)		(17,678)
Total deferred tax liabilities	(49,178)		(47,214)
Deferred tax assets, net	$	118,553	$	86,513

Reconciliation Between Federal Statutory Income Tax Rate and Effective Tax Rate

A reconciliation of the provision for income taxes, with the amount computed by applying the U.S. federal statutory income tax rate of 21% to income before provision for income taxes for fiscal 2025, 2024 and 2023 is shown below:

	Year Ended September 30,
	2025		2024		2023
	(In thousands)
Income tax provision at U.S. federal statutory rate	$	168,545	$	134,825	$	116,261
State income taxes, net of U.S. federal benefit	18,733		13,109		14,135
Foreign tax rate differential	5,812		6,675		9,489
Research credits	(6,683)		(5,472)		(3,600)
Valuation allowance	—		(2,183)		(14,451)
Excess tax benefits relating to share-based compensation	(27,638)		(14,907)		(949)
GILTI, FDII, BEAT and FTC	(10,896)		(9,265)		(9,010)
Other	2,776		6,432		12,374
Recorded income tax provision	$	150,649	$	129,214	$	124,249

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: 

	Year Ended September 30,
	2025		2024		2023
	(In thousands)
Gross unrecognized tax benefits at beginning of year	$	19,879	$	13,849	$	12,980
Gross increases for tax positions in prior years	678		4,769		—
Gross decreases for tax positions in prior years	—		(1,956)		(1,127)
Gross increases based on tax positions related to the current year	3,675		4,277		3,650
Decreases for settlements and payments	—		—		(523)
Decreases due to statute expiration	(4,727)		(1,060)		(1,131)
Gross unrecognized tax benefits at end of year	$	19,505	$	19,879	$	13,849