Stock-based Compensation (Tables)

12 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Restricted Stock and Restricted Stock Unit Activity

Fiscal 2019 activity of restricted stock units subject to performance and/or market conditions is presented below:

	Units			Weighted Average Grant Date Fair Value Per Unit
Nonvested at September 30, 2018		266,082		$	66.69
Granted		99,260		$	80.72
Vested		(45,157	)	$	62.39
Forfeited		(56,275	)	$	64.74
Nonvested at September 30, 2019		263,910		$	73.11

Time-vested restricted stock and stock unit activity for fiscal 2019 is presented below:

	Shares/ Units			Weighted Average Grant Date Fair Value Per Share
Nonvested at September 30, 2018		103,600		$	64.60
Granted		49,340		$	77.14
Vested		(50,013	)	$	60.45
Forfeited		(6,650	)	$	69.64
Nonvested at September 30, 2019		96,277		$	72.83

Significant Assumptions Used in the Monte Carlo simulations

The significant assumptions used in the Monte Carlo simulations are as follows:

	2019		2018		2017
Risk-free interest rate	2.88%		1.76%		1.39%
Expected dividend yield of stock		—		—		—
Expected volatility of stock	17.0%		16.0%		16.3%
Vesting period	3.0 years		2.9 years		2.8 years

Compensation Cost Recognized for Share-based Compensation Arrangements

The amounts of compensation cost recognized for share-based compensation arrangements are presented below:

	2019			2018			2017
Total compensation cost	$	8.6		$	6.9		$	7.4
Compensation cost capitalized		(1.4	)		(1.3	)		(3.3	)
Prior period disallowed stock compensation capitalization		—			6.9			—
Compensation cost recognized in net income		7.2			12.5			4.1
Income tax benefit recognized in net income		(1.7	)		(4.0	)		(1.5	)
Compensation cost recognized in net income, net of income tax	$	5.5		$	8.5		$	2.6