Share-Based Compensation - Summary of Stock Option Activity (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Mar. 31, 2015
Stock Options
Number of Options:
Outstanding at October 1, 2014 (shares)	833
Granted (shares)	0
Exercised (shares)	(60)
Forfeited (shares)	(2)
Expired (Shares)	(8)
Outstanding at March 31, 2015 (shares)	763
Exercisable at March 31, 2015 (shares)	704
Wtd. Avg. Exercise Price (in dollars per share):
Outstanding at October 1, 2014 (dollars per share)	$ 33.52
Granted (dollars per share)	$ 0.00
Exercised (dollars per share)	$ 15.30
Forfeited (dollars per share)	$ 41.60
Expired (dollars per share)	$ 12.31
Outstanding at March 31, 2015 (dollars per share)	$ 35.15
Exercisable at March 31, 2015 (dollars per share)	$ 34.61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Wtd. Avg. Remaining Contractual Life (Years), Outstanding at March 31, 2015	4 years 10 months 25 days
Wtd. Avg. Remaining Contractual Life (Years), Exercisable at March 31, 2015	4 years 8 months 12 days
Aggregate Intrinsic Value, Exercised	$ 1,113
Aggregate Intrinsic Value, Outstanding at March 31, 2015	1,505
Aggregate Intrinsic Value, Exercisable at March 31, 2015	$ 1,505