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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted stock and restricted stock unit activity
Fiscal year 2016 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, 2015
397,270

 
$
36.28

Granted (maximum shares that can be earned)
199,140

 
$
45.95

Vested
(62,593
)
 
$
35.29

Forfeited
(23,234
)
 
$
30.96

Nonvested at September 30, 2016
510,583

 
$
40.37

Time-vested restricted stock and stock unit activity for fiscal year 2016 is presented below:
 
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested at September 30, 2015
129,304

 
$
44.89

Granted
48,730

 
$
60.65

Vested
(44,645
)
 
$
47.30

Forfeited
(610
)
 
$
53.12

Nonvested at September 30, 2016
132,779

 
$
49.83
Stock option awards activity
No stock options were granted during fiscal years 2016, 2015, and 2014. Stock option activity for fiscal year 2016 is presented below:
 
Stock
Options
 
Weighted
Average
Exercise
Price
Per Share
Outstanding at September 30, 2015
28,500

 
$
33.65

Exercised
(27,750
)
 
$
33.66

Forfeited
(750
)
 
$
33.45

Outstanding at September 30, 2016
—

 
$
—
Significant assumptions used in the Monte Carlo simulations
The significant assumptions used in the Monte Carlo simulations are as follows:
 
2016
 
2015
 
2014
Risk free interest rate
1.14%
 
0.83%
 
0.53%
Expected dividend yield of stock
—
 
—
 
—
Expected volatility of stock
15.0%
 
14.0%
 
18.0%
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:
 
2016
 
2015
 
2014
Total equity compensation cost
$
6.7

 
$
6.7

 
$
5.8

Compensation cost capitalized
(2.2
)
 
(1.8
)
 
(1.8
)
Compensation cost recognized in net income
$
4.5

 
$
4.9

 
$
4.0

Income tax benefit recognized in net income
(1.7
)
 
(1.9
)
 
(1.5
)
Compensation cost recognized in net income, net of income tax
$
2.8

 
$
3.0

 
$
2.5