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Stock-based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

The effect of stock-based compensation on our statements of operations, including discontinued operations, is presented below.

	2017				2016				2015
	(in millions, except per share data)
Decrease in operating income	$	8.6			$	9.1			$	7.0
Decrease in net income	4.8				5.8				4.4
Decrease in earnings per basic share	0.03				0.04				0.03
Decrease in earnings per diluted share	0.03				0.04				0.03

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, 2014	1,206,761			$	5.04			0.7
Granted	459,659			9.70
Vested	(793,630	)		3.99						$	7.7
Cancelled	—			—
Outstanding at September 30, 2015	872,790			8.45				0.8
Granted	360,255			9.33
Vested	(510,535	)		7.94						4.7
Cancelled	(59,062	)		8.23
Outstanding at September 30, 2016	663,448			9.34				1.0
Granted	343,860			13.05
Vested	(359,797	)		9.34						4.7
Cancelled	(21,681	)		13.26
Outstanding at September 30, 2017	625,830			$	11.23			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 27, 2012		2016		2013		$	5.22			135,553			—			135,553			2.000		271,106
				2014		$	8.52			135,553			—			135,553			2.000		271,106
				2015		$	9.78			135,552			—			135,552			0.000		—
December 3, 2013		2017		2014		$	8.52			90,841			(4,401	)		86,440			2.000		172,880
				2015		$	9.78			90,841			(4,401	)		86,440			0.000		—
				2016		$	9.38			90,849			(7,402	)		83,447			1.021		85,195
December 2, 2014		2018		2015		$	9.78			80,233			(3,835	)		76,398			0.000		—
				2016		$	9.38			80,229			(6,447	)		73,782			1.021		75,327
				2017		$	13.26			80,229			(11,673	)		68,556			1.000		68,556
December 1, 2015		2019		2016		$	9.38			77,823			(3,998	)		73,825			1.021		75,375
				2017		$	13.26			77,824			(3,997	)		73,827			1.000		73,827
				2018						77,824			(6,752	)		71,072
November 29, 2016		2020		2017		$	13.26			59,285			(5,279	)		54,006			1.000		54,006
				2018						59,286			(7,227	)		52,059
				2019						59,290			(7,227	)		52,063
January 23, 2017		2020		2017		$	13.15			19,012			—			19,012			1.000		19,012
				2018						19,011			—			19,011
				2019						19,011			—			19,011

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, 2014	4,552,235			$	6.37			5.0		$	13.6
Granted	97,119			9.97
Exercised	(506,632	)		3.42						3.2
Cancelled	(150,056	)		13.90
Outstanding at September 30, 2015	3,992,666			6.54				4.2		9.3
Exercised	(270,599	)		6.83						0.8
Cancelled	(167,759	)		17.82
Outstanding at September 30, 2016	3,554,308			5.99				3.4		23.8
Exercised	905,834			4.71						7.3
Cancelled	(207,820	)		14.72
Outstanding at September 30, 2017	2,440,654			$	5.72			2.5		$	17.3
Exercisable at September 30, 2017	2,415,475			$	5.67			2.5		$	17.2
Expected to vest after September 30, 2017	25,179			$	9.97			7.3		$	0.1

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

The ranges of exercise prices for stock options outstanding at September 30, 2017 are summarized below.

Exercise price										Options			Weighted average exercise price				Weighted average remaining contractual term (years)		Exercisable options			Weighted average exercise price
	$	0.00		-	$	4.99				804,173			$	3.29			3.4		804,173			$	3.29
	$	5.00		-	$	9.99				1,330,050			6.05				2.5		1,304,871			5.97
	$	10.00		-	$	14.99				306,431			10.66				0.2		306,431			10.66
										2,440,654			$	5.72			2.5		2,415,475			$	5.67

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

The weighted average grant-date fair values of stock options granted in 2015 and the weighted average assumptions used to determine these fair values are indicated below.

Grant-date fair value	$	5.93
Risk-free interest rate	1.74		%
Dividend yield	0.80		%
Expected life (years)	8.0
Expected annual volatility	0.6199

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, 2014	643,288			$	6.22			0.8
Granted	289,524			9.78
Vested	(317,409	)								$	3.1
Cancelled	(56,525	)		8.29
Outstanding at September 30, 2015	558,878			8.49				0.8
Granted	302,875			9.84
Vested	(270,822	)								2.5
Cancelled	(56,905	)		9.28
Outstanding at September 30, 2016	534,026			9.60				0.9
Granted	199,260			13.22
Vested	(278,000	)								3.7
Cancelled	(103,279	)		10.87
Outstanding at September 30, 2017	352,007			$	11.36			0.9

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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

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Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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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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