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Share-Based Compensation
 3 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
SHARE-BASED COMPENSATION

Share-based compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the requisite service period, which is generally the vesting period of the equity award. As of December 31, 2013, unrecognized compensation cost, net of estimated forfeitures, related to stock options and restricted stock awards was approximately $2.8 million and $27.4 million, respectively, which we expect to recognize over a weighted average period of approximately 2.3 years.

Stock Options

Under our stock incentive plans, the exercise price of each stock option must be equal to or greater than the fair market value of one share of our common stock on the date of grant, with all outstanding options having a maximum term of 10 years. Options vest ratably over a period ranging from the end of the first to the fourth year from the date of grant for stock options. Each option is for the purchase of one share of our common stock.

A summary of stock option activity during the three months ended December 31, 2013 is as follows:
 
 
Number of Options (000s)
 
Wtd. Avg. Exercise Price
 
Wtd. Avg. Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value (000s)
Outstanding at October 1, 2013
989

 
$
33.21

 
5.9
 
$
21,592

Granted
—

 
$
—

 
 
 
 
Exercised
(24)

 
$
34.63

 
 
 
$
476

Forfeited
(17)

 
$
40.26

 
 
 
 
Outstanding at December 31, 2013
948

 
$
33.04

 
5.6
 
$
19,178

Exercisable at December 31, 2013
761

 
$
31.29

 
5.1
 
$
15,355



Restricted Stock

We have awarded restricted stock to certain employees and to our non-employee directors. All current awards of restricted stock to employees are subject to a vesting and restriction period ranging from three to four years, subject to acceleration upon certain events as set forth in the terms of the grant. In addition, certain awards of restricted stock to employees are subject to market-based performance conditions. The number of shares that vest based on market-based performance conditions will depend on the degree of achievement of specified corporate performance criteria which are strictly market-based. All awards of restricted stock to non-employee directors are subject to a vesting and restriction period of a minimum of 13 months, subject to acceleration upon certain events as set forth in the terms of the grant. We value restricted stock awards based on the fair market value of our common stock on the date of grant and also adjust to fair market value for any awards subject to market-based performance conditions, where applicable.

A summary of restricted stock activity for the three months ended December 31, 2013 is as follows:
 
 
Number of Shares (000s)
 
Wtd. Avg. Fair Value
Unvested at October 1, 2013
849
 
$
42.42

Granted
297
 
$
54.62

Vested
(132)
 
$
37.29

Forfeited
(34)
 
$
41.17

Unvested at December 31, 2013
980
 
$
46.85