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Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

The effect of stock-based compensation on our consolidated statements of operations within Selling, general and administrative costs is presented below.

			2023						2022						2021
			(in millions, except per share data)
Decrease in operating income			$	11.1					$	9.9					$	11.0
Decrease in net income			8.7						7.6						8.2
Decrease in earnings per basic share			0.06						0.05						0.05
Decrease in earnings per diluted share			$	0.06					$	0.05					$	0.05

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, 2020			408,506						$	11.41					0.9
Granted			220,795						12.29
Vested			(228,121)						11.62												$	2.8
Cancelled			(5,083)						11.41
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

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 29, 2016						2020						2017						$	13.26					59,285						(5,279)						54,006						1.000						54,006
												2018						$	12.50					59,286						(39,910)						19,376						1.357						26,294
												2019						$	10.53					59,290						(39,909)						19,381						0.645						12,501
January 23, 2017						2020						2017						$	13.15					19,012						—						19,012						1.000						19,012
												2018						$	12.50					19,011						—						19,011						1.357						25,798
												2019						$	10.53					19,011						—						19,011						0.645						12,263
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						(80,337)						85,947						—						—

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, 2020			328,099						$	6.11					2.3						$	1.4
Granted			431,520						11.86
Exercised			(151,399)						4.09												1.7
Cancelled			(8,421)						—
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
Exercisable at September 30, 2023			412,095						$	11.97					6.5						$	0.4

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

The ranges of exercise prices for stock options outstanding at September 30, 2023 are summarized below.

Exercise price																		Options						Weighted average exercise price						Weighted average remaining contractual term (years)						Exercisable options						Weighted average exercise price
			$	5.00		-			$	9.99								61,341						$	9.31					0.9						61,341						$	9.31
			$	10.00		-			$	14.99								1,066,127						$	12.26					8.2						348,050						$	12.43
																		1,127,468						$	12.10					7.8						409,391						$	11.97

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, 2020			314,475						$	11.16					0.9
Granted			185,808						11.91
Vested			(131,182)																		$	1.6
Cancelled			(24,257)						11.30
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

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

The assumptions used to determine the grant date fair value are indicated below for grants issued during our 2023 fiscal year.

			November 29, 2022
Variables used in determining grant date fair value:
Dividend yield			1.80%
Risk-free rate			3.89%
Expected term (in years)			6.00

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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