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Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2025

Sep. 30, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity

Restricted stock unit activity under the 2006 Plan is summarized below:

			Restricted stock units						Weighted average grant date fair value per unit
Outstanding as of September 30, 2022			358,732						$	12.77
Granted			625,518						12.78
Vested			(301,864)						12.83
Cancelled			(109,103)						12.00
Outstanding as of September 30, 2023			573,283						12.88
Granted			301,908						14.91
Vested			(367,315)						12.99
Cancelled			(54,080)						12.85
Outstanding as of September 30, 2024			453,796						14.15
Granted			194,334						26.13
Vested			(283,026)						13.81
Cancelled			(10,770)						18.55
Outstanding as of September 30, 2025			354,334						$	20.85

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

Stock-settled PRSUs activity under the 2006 Plan is summarized below:

Award date						Settlement year						Performance period						Grant date per unit fair value						Units awarded						Units forfeited						Net units						Performance factor						Shares earned
December 3, 2019						2023						2020						$	11.26					69,988						(2,391)						67,597						0.909						61,446
												2021						11.86						69,989						(9,614)						60,375						1.161						70,096
												2022						13.81						69,988						(9,614)						60,374						0.700						42,262
November 29, 2022						2026						2023-2025						11.41						166,284						(92,550)						73,734						2.000						147,468
November 28, 2023						2027						2024-2026						13.22						136,983						(30,804)						106,179						—						—
December 3, 2024						2028						2025-2027						25.58						64,044						(1,308)						62,736						—						—
March 3, 2025						2028						2025-2027						$	25.19					7,692						—						7,692						—						—

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The table below provides information regarding MRSU awards for grants issued during our 2025 fiscal year, which were valued using Monte Carlo simulations on the grant date:

			March 3, 2025						December 3, 2024
Fair value at grant date			$41.24						$38.25
Units granted			7,692						64,044
Variables used in determining grant date fair value:
Dividend yield			1.1		%				1.1		%
Expected volatility			31.0		%				29.8		%
Risk-free rate			3.9		%				4.1		%
Expected term (in years)			2.60						2.80

The assumptions used to determine the grant date fair value are indicated below for grants issued during our 2025 fiscal year:

			March 3, 2025						December 3, 2024
Variables used in determining grant date fair value:
Dividend yield			1.4		%				1.6		%
Expected volatility			36.3		%				29.9		%
Risk-free rate			4.0		%				4.1		%
Expected term (in years)			6.00						6.00

Schedule of Share-based Compensation. Options

Stock option activity under the 2006 Plan is summarized below:

			Options						Weighted average exercise price per option						Weighted average remaining contractual term (years)						Aggregate intrinsic value (millions)
Outstanding as of September 30, 2022			1,013,293						$	12.19					7.7						$	0.3
Granted			573,279						11.41
Exercised			(131,989)						9.59												0.4
Cancelled			(327,115)						12.16
Outstanding as of September 30, 2023			1,127,468						12.10						7.8						$	1.0
Granted			457,356						13.22
Exercised			(517,839)						12.05												5.0
Cancelled			(135,215)						12.69
Outstanding as of September 30, 2024			931,770						12.60						7.9						$	8.5
Granted			228,615						25.54
Exercised			(246,577)						12.33												3.3
Cancelled			(5,604)						19.45
Outstanding as of September 30, 2025			908,204						$	15.89					7.8						$	8.8
Exercisable as of September 30, 2025			374,295						$	12.60					6.8						$	4.8

Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]

The ranges of exercise prices for stock options outstanding as of September 30, 2025 are summarized below:

Exercise price																		Outstanding Options						Weighted average exercise price						Weighted average remaining contractual term (years)						Exercisable options						Weighted average exercise price
			$	10.00		-			$	14.99								682,415						$	12.70					7.3						374,295						$	12.60
			$	25.00		-			$	29.99								225,789						25.54						9.2						—						—
																		908,204						$	15.89											374,295						$	12.60

Schedule of Share-based Compensation, Phantom Award, Activity

Phantom Plan activity is summarized below:

			Phantom Plan units						Weighted average grant date fair value   per unit						Aggregate intrinsic value (millions)
Outstanding as of September 30, 2022			339,131						$	12.74
Granted			294,063						11.53
Vested			(156,012)												$	0.1
Cancelled			(120,515)						12.22
Outstanding as of September 30, 2023			356,667						12.09
Granted			236,250						13.28
Vested			(156,585)												$	1.5
Cancelled			(20,952)						12.53
Outstanding as of September 30, 2024			415,380						12.71
Granted			143,589						25.61
Vested			(195,118)												$	2.5
Cancelled			(39,482)						16.01
Outstanding as of September 30, 2025			324,369						$	18.03

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