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Share-Based Compensation (Tables)
 6 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share-based Compensation Arrangements
A summary of our share-based compensation expense during the six months ended March 31, 2016 and 2015 is as follows:
 
Six Months Ended March 31,
(In thousands, except average service periods)
2016
 
2015
Share-based compensation recognized
$
5,009

 
$
8,119

Unrecognized compensation cost, net of estimated forfeitures
21,469

 
26,310

Remaining weighted-average service period (years)
2.1

 
2.0
Schedule of Restricted Stock Activity
A summary of our restricted stock activity for the six months ended March 31, 2016 is as follows:
 
Number of Shares (000s)
 
Weighted Average Fair Value
Unvested as of October 1, 2015
711

 
$
43.14

Granted
642

 
14.32

Vested
(190
)
 
44.96

Forfeited
(76
)
 
32.10

Unvested as of March 31, 2016
1,087

 
26.15
Schedule of Performance-based Units Activity
A summary of Performance Units stock activity for the six months ended March 31, 2016 is as follows:
 
 
Number of Shares (000s)
 
Weighted Average Fair Value
Unvested as of October 1, 2015
240

 
$
43.73

Granted
254

 
15.63

Vested
—

 
—

Forfeited
—

 
—

Unvested as of March 31, 2016
494

 
26.69
Summary of Stock Option Activity
A summary of stock option activity for the six months ended March 31, 2016 is as follows:
 
Number of
Options
(000s)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value  (000s)
Outstanding as of October 1, 2015
685

 
$
34.90

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
—

Forfeited
—

 
—

 
 
 
 
Expired
(17
)
 
27.25

 
 
 
 
Outstanding as of March 31, 2016
668

 
35.10

 
3.8
 
(17,325
)
Exercisable as of March 31, 2016
668

 
35.10

 
3.8
 
(17,325
)