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STOCK INCENTIVE PLANS (Tables)
 6 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted-Average Assumptions Used to Estimate the Grant Date Fair Values for Stock Options Granted
The fair value of each option award is estimated on the date of grant using the Black-Scholes model. The following assumptions were used in these calculations:
 
 
November 2014 Grants

 
November 2013 Grants

Weighted average grant date fair value
 
$
8.37

 
$
11.72

Expected life
 
5.40 years

 
5.40 years

Volatility
 
37.47
%
 
50.55
%
Risk-free interest rate
 
1.73
%
 
1.48
%
Dividend yield
 
—
%
 
—
%
Stock Options Activity
The balance of outstanding stock options and all options activity at and for the six months ended March 31, 2015, are as follows:
 
 
Number of
Shares

 
Weighted
Average
Exercise Price
 
Weighted Average
Remaining
Contractual Term
(Years)
 
Aggregate
Intrinsic
Value
(Millions)

Outstanding at September 30, 2014
 
3,357,050

 
$
27

 
1/10 
 
4.86 years
 
 
Granted
 
341,750

 
$
22

 
3/4 
 
 
 
 
Exercised
 
(228,696
)
 
$
17

 
1/8 
 
 
 
 
Forfeited
 
(37,104
)
 
$
22

 
1/2 
 
 
 
 
Outstanding at March 31, 2015
 
3,433,000

 
$
27

 
2/5 
 
5.11 years
 
$
2.54

Exercisable at March 31, 2015
 
2,424,400

 
$
28

 
1/5 
 
3.74 years
 
$
2.04
Intrinsic Value of Stock Options Exercised
During the three and six-month periods ended March 31, 2015 and 2014, the following activity occurred under the Incentive Stock Plan:
 
 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
 
2015

 
2014

 
2015

 
2014

Total intrinsic value of stock options exercised
 
$
508

 
$
704

 
$
1,141

 
$
1,017

Cash received from stock option exercises
 
$
468

 
$
1,558

 
$
1,573

 
$
2,138