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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted stock and restricted stock unit activity
Fiscal 2018 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, 2017
282,015

 
$
56.32

Granted
87,960

 
$
79.88

Vested
(81,933
)
 
$
47.80

Forfeited
(21,960
)
 
$
56.73

Nonvested at September 30, 2018
266,082

 
$
66.69

Time-vested restricted stock and stock unit activity for fiscal 2018 is presented below:
 
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested at September 30, 2017
110,940

 
$
55.85

Granted
47,780

 
$
73.85

Vested
(47,928
)
 
$
53.48

Forfeited
(7,192
)
 
$
65.25

Nonvested at September 30, 2018
103,600

 
$
64.60
Significant assumptions used in the Monte Carlo simulations
The significant assumptions used in the Monte Carlo simulations are as follows:
 
2018
 
2017
 
2016
Risk-free interest rate
1.76%
 
1.39%
 
1.14%
Expected dividend yield of stock
—
 
—
 
—
Expected volatility of stock
16.0%
 
16.3%
 
15.0%
Vesting period
2.9 years
 
2.8 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:
 
2018
 
2017
 
2016
Total compensation cost
$
6.9

 
$
7.4

 
$
6.7

Compensation cost capitalized
(1.3
)
 
(3.3
)
 
(2.2
)
Prior period disallowed stock compensation capitalization
$
6.9

 
$
—

 
$
—

Compensation cost recognized in net income
12.5

 
4.1

 
4.5

Income tax benefit recognized in net income
(4.0
)
 
(1.5
)
 
(1.7
)
Compensation cost recognized in net income, net of income tax
$
8.5

 
$
2.6

 
$
2.8