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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Provision (Benefit)

The components of the income tax provision were as follows (in thousands): 

			Year Ended September 30,
			2025						2024						2023
Current:
Federal			$	40,543					$	45,271					$	18,129
State			9,052						8,101						4,036
Foreign			8,076						342						107
			57,671						53,714						22,272
Deferred:
Federal			(5,083)						(11,872)						(7,458)
State			(1,144)						(1,620)						(1,499)
Foreign			1,359						6,018						1,110
			(4,868)						(7,474)						(7,847)
Total income tax provision			$	52,803					$	46,240					$	14,425

Schedule of Income Before Income Taxes

Income before income taxes was as follows (in thousands): 

			Year Ended September 30,
			2025						2024						2023
U.S.			$	193,656					$	167,887					$	56,923
Foreign			39,894						28,201						12,027
Income before income taxes			$	233,550					$	196,088					$	68,950

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the statutory U.S. income tax rate and the effective income tax rate, as computed on earnings before income tax provision (benefit) in each of the three years presented in the Consolidated Statements of Operations, was as follows:

			Year Ended September 30,
			2025						2024						2023
Statutory rate			21		%				21		%				21		%
State income taxes, net of federal benefit			3						3						3
Research and development credit			(1)						(1)						(2)
Foreign rate differential			1						—						—
Valuation allowance			—						—						(3)
Non-deductible expenses			2						1						1
Impact of U.S. global intangible taxes and benefits			—						1						1
Stock-based compensation			(3)						(1)						—
Effective rate			23		%				24		%				21		%

Schedule of Deferred Tax Assets and Liabilities

The tax effect of temporary differences between U.S. GAAP accounting and federal income tax accounting, creating deferred income tax assets and liabilities, was as follows (in thousands):

			September 30,
			2025						2024
Deferred Tax Assets:
Research and experimental expenditures			$	18,406					$	12,552
Long-term contracts			6,801						7,480
Deferred compensation			3,306						2,868
Uniform capitalization and inventory			2,016						1,511
Warranty accrual			1,447						1,304
Stock-based compensation			1,367						1,269
Reserve for accrued employee benefits			1,189						1,029
Net operating loss			1,086						1,248
Credit carryforwards			797						1,304
Other			671						655
Deferred tax assets			$	37,086					$	31,220
Deferred Tax Liabilities:
Depreciation and amortization			$	(5,687)					$	(3,773)
Retention and other			(1,597)						(1,310)
Deferred tax liabilities			$	(7,284)					$	(5,083)
Less: valuation allowance			(1,659)						(1,599)
Net deferred tax asset			$	28,143					$	24,538

Schedule of Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of the unrecognized tax benefits follows (in thousands):

			Year Ended September 30,
			2025						2024						2023
Balance at beginning of period			$	1,739					$	1,889					$	1,377
Increases related to tax positions taken during the current period			540						460						400
Increases related to tax positions taken during a prior period			185						70						112
Decreases related to expiration of statute of limitations			(316)						(680)						—
Decreases related to settlement with taxing authorities			—						—						—
Balance at end of period			$	2,148					$	1,739					$	1,889

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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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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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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