Share-Based Compensation to Employees (Summary of Stock Options Outstanding and Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Additional disclosure
Share-based compensation expense	$ 12,628	$ 2,676	$ 1,468
Stock Options [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)	3,302
Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 14.41
Outstanding - Weighted Average Remaining Contractual Life	7 years 2 months 16 days
Exercisable - Options (in shares)	1,833
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 14.16
Exercisable - Weighted Average Remaining Contractual Life	5 years 7 months 28 days
Additional disclosure
Intrinsic value of vested options	53,004
Intrinsic value of outstanding options	94,667
Total unrecognized compensation expense related to non-vested employee options	$ 10,241
Weighted average period for recognition of unrecognized compensation expense	2 years 3 months 28 days
Stock Options [Member] | $0.00 - $4.26 [Member]
Options outstanding and exercisable
Exercise price per share, low end of range (in dollars per share)	$ 0.00
Exercise price per share, high end of range (in dollars per share)	$ 4.26
Outstanding - Options (in shares)	55
Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 3.50
Outstanding - Weighted Average Remaining Contractual Life	3 years 2 months 10 days
Exercisable - Options (in shares)	55
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 3.50
Exercisable - Weighted Average Remaining Contractual Life	3 years 2 months 10 days
Stock Options [Member] | $8.52 - $12.77 [Member]
Options outstanding and exercisable
Exercise price per share, low end of range (in dollars per share)	$ 8.52
Exercise price per share, high end of range (in dollars per share)	$ 12.77
Outstanding - Options (in shares)	507
Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 10.34
Outstanding - Weighted Average Remaining Contractual Life	6 years 6 months 16 days
Exercisable - Options (in shares)	376
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 10.45
Exercisable - Weighted Average Remaining Contractual Life	6 years 2 months 16 days
Stock Options [Member] | $12.77- $17.03 [Member]
Options outstanding and exercisable
Exercise price per share, low end of range (in dollars per share)	$ 12.77
Exercise price per share, high end of range (in dollars per share)	$ 17.03
Outstanding - Options (in shares)	2,715
Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 15.13
Outstanding - Weighted Average Remaining Contractual Life	7 years 4 months 20 days
Exercisable - Options (in shares)	1,402
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 15.57
Exercisable - Weighted Average Remaining Contractual Life	5 years 7 months 10 days
Stock Options [Member] | $38.32 - $42.58 [Member]
Options outstanding and exercisable
Exercise price per share, low end of range (in dollars per share)	$ 38.32
Exercise price per share, high end of range (in dollars per share)	$ 42.58
Outstanding - Options (in shares)	25
Outstanding - Weighted Average Exercise Price (in dollars per share)	$ 41.85
Outstanding - Weighted Average Remaining Contractual Life	9 years 11 months 6 days
Exercisable - Options (in shares)	0
Exercisable - Weighted Average Exercise Price (in dollars per share)	$ 0.00
Exercisable - Weighted Average Remaining Contractual Life	0 years