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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted stock and restricted stock unit activity
Time-vested restricted stock and stock unit activity for fiscal year 2015 is presented below:
 
Shares/
Units
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested at September 30, 2014
141,093

 
$
42.02

Granted
61,247

 
$
51.78

Vested
(67,747
)
 
$
43.95

Forfeited
(5,289
)
 
$
45.45

Nonvested at September 30, 2015
129,304

 
$
44.89

Fiscal year 2015 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, 2014
293,019

 
$
36.18

Granted (maximum shares that can be earned)
216,476

 
$
36.69

Vested
(60,388
)
 
$
40.01

Forfeited
(51,837
)
 
$
33.06

Nonvested at September 30, 2015
397,270

 
$
36.28
Stock option awards activity
No stock options were granted during fiscal years 2015, 2014, and 2013. Stock option activity for fiscal year 2015 is presented below:
 
Stock
Options
 
Weighted
Average
Exercise
Price
Per Share
 
Weighted
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at September 30, 2014
79,750

 
$
32.42

 
 
 
 
Exercised
(47,000
)
 
$
31.76

 
 
 
 
Forfeited
(4,250
)
 
$
30.95

 
 
 
 
Outstanding at September 30, 2015
28,500

 
$
33.65

 
0.8
 
$
0.6

Fully Vested and Expected to Vest at September 30, 2015
28,500

 
$
33.65

 
0.8
 
$
0.6

Exercisable at September 30, 2015
28,500

 
$
33.65

 
0.8
 
$
0.6
Significant assumptions used in the Monte Carlo simulations
The significant assumptions used in the Monte Carlo simulations are as follows:
 
2015
 
2014
 
2013
Risk free interest rate
0.83%
 
0.53%
 
0.32%
Expected dividend yield of stock
—
 
—
 
—
Expected volatility of stock
14.0%
 
18.0%
 
19.6%
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:
 
2015
 
2014
 
2013
Total equity compensation cost
$
6.7

 
$
5.8

 
$
4.5

Compensation cost capitalized
(1.8
)
 
(1.8
)
 
(1.4
)
Compensation cost recognized in net income
$
4.9

 
$
4.0

 
$
3.1

Income tax benefit recognized in net income
(1.9
)
 
(1.5
)
 
(1.2
)
Compensation cost recognized in net income, net of income tax
$
3.0

 
$
2.5

 
$
1.9