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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted stock and restricted stock unit activity
2017 activity of restricted stock and restricted stock units subject to performance and/or market conditions is presented below:
 
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested at September 30, 2016
510,583

 
$
40.37

Granted (maximum shares that can be earned)
196,400

 
$
45.01

Vested
(78,825
)
 
$
42.37

Forfeited
(64,128
)
 
$
33.03

Nonvested at September 30, 2017 (at maximum)
564,030

 
$
42.51

Nonvested at September 30, 2017 (at target)
282,015

 
$
56.32

Time-vested restricted stock and stock unit activity for fiscal 2017 is presented below:
 
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested at September 30, 2016
132,779

 
$
49.83

Granted
44,090

 
$
63.15

Vested
(58,200
)
 
$
47.67

Forfeited
(7,729
)
 
$
55.58

Nonvested at September 30, 2017
110,940

 
$
55.85
Stock option awards activity
No stock options were granted during fiscal years 2017, 2016, and 2015. There was no stock option activity in fiscal 2017, as all outstanding stock options either vested or forfeited in fiscal 2016.
Significant assumptions used in the Monte Carlo simulations
The significant assumptions used in the Monte Carlo simulations are as follows:
 
2017
 
2016
 
2015
Risk-free interest rate
1.39%
 
1.14%
 
0.83%
Expected dividend yield of stock
—
 
—
 
—
Expected volatility of stock
16.3%
 
15.0%
 
14.0%
Vesting period
2.8 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:
 
2017
 
2016
 
2015
Total compensation cost
$
7.4

 
$
6.7

 
$
6.7

Compensation cost capitalized
(3.3
)
 
(2.2
)
 
(1.8
)
Compensation cost recognized in net income
$
4.1

 
$
4.5

 
$
4.9

Income tax benefit recognized in net income
(1.5
)
 
(1.7
)
 
(1.9
)
Compensation cost recognized in net income, net of income tax
$
2.6

 
$
2.8

 
$
3.0