Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2024

Sep. 30, 2023

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		Weighted average remaining contractual term (years)	Aggregate intrinsic value   (millions)
Outstanding at September 30, 2021	396,097	$	11.78	0.8
Granted	223,379	13.41
Vested	(251,981)	11.81			$	2.8
Cancelled	(8,763)	11.87
Outstanding at September 30, 2022	358,732	12.77		0.7
Granted	625,518	12.78
Vested	(301,864)	12.83			$	7.3
Cancelled	(109,103)	12.00
Outstanding at September 30, 2023	573,283	12.88		0.9
Granted	301,908	14.91
Vested	(367,315)	12.99			$	9.8
Cancelled	(54,080)	12.85
Outstanding at September 30, 2024	453,796	$	14.15	0.9

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
November 28, 2017	2021	2018	$	12.50	57,092	—	57,092	1.357	77,474
		2019	$	10.53	57,092	(4,793)	52,299	0.645	33,733
		2020	$	11.26	57,104	(21,679)	35,425	0.909	32,202
November 27, 2018	2022	2019	$	10.53	110,954	(8,751)	102,203	0.645	65,921
		2020	$	11.26	110,954	(13,182)	97,772	0.909	88,875
		2021	$	11.86	110,967	(28,478)	82,489	1.161	95,770
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	—	—
November 28, 2023	2027	2024-2026	$	13.22	136,983	(28,308)	108,675	—	—

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

The table below provides information regarding MRSU awards, which were valued using Monte Carlo simulations on the grant date:

	November 28, 2023			November 29, 2022			November 30, 2021
Fair value at grant date	$	18.11		$	15.08		$	15.76
Units granted	136,983			166,284			230,089
Variables used in determining grant date fair value:
Dividend yield	2.00		%	2.20		%	1.70		%
Risk-free rate	4.50		%	4.20		%	0.76		%
Expected term (in years)	2.84			2.83			2.83

The assumptions used to determine the grant date fair value are indicated below for grants issued during our 2024 fiscal year:

	November 28, 2023
Variables used in determining grant date fair value:
Dividend yield	1.94%
Risk-free rate	4.33%
Expected term (in years)	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 at September 30, 2021	599,799	$	10.67	7.8	$	2.7
Granted	457,482	13.64
Exercised	(36,731)	5.67			0.2
Cancelled	(7,257)
Outstanding at 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)
Outstanding at 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)
Outstanding at September 30, 2024	931,770	$	12.60	7.9	$	8.5
Exercisable at September 30, 2024	322,467	$	12.31	6.4	$	3.0

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

The ranges of exercise prices for stock options outstanding at September 30, 2024 are summarized below:

Exercise price						Outstanding Options	Weighted average exercise price		Weighted average remaining contractual term (years)	Exercisable options	Weighted average exercise price
	$	5.00	-	$	9.99	21,582	$	9.97	0.3	21,582	$	9.97
	$	10.00	-	$	14.99	910,188	$	12.66	8.1	300,885	$	12.47
						931,770	$	12.60		322,467	$	12.31

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		Weighted average remaining contractual term (years)	Aggregate intrinsic value   (millions)
Outstanding at September 30, 2021	344,844	$	11.51	0.9
Granted	203,834	13.60
Vested	(162,969)				$	1.6
Cancelled	(46,578)	12.39
Outstanding at September 30, 2022	339,131	12.74		1.1
Granted	294,063	11.53
Vested	(156,012)				$	1.9
Cancelled	(120,515)	12.22
Outstanding at September 30, 2023	356,667	12.09		1.0
Granted	236,250	13.28
Vested	(156,585)				$	1.9
Cancelled	(20,952)	12.53
Outstanding at September 30, 2024	415,380	$	12.71	0.9