Share-Based Compensation to Employees (Summary of Stock Options Outstanding and Exercisable) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2012	Oct. 01, 2014
Options outstanding and exercisable
Shared-based Compensation Arrangement by Shared-based Payment Award, RSUs Terminated		1,000
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost		$ 9
Additional disclosure
Share-based compensation expense	1,583				8,375	12,628	2,676
Vesting Period, Grants					3 years
Employee Stock Ownership Plan (ESOP), Compensation Expense					26
Stock Issued During Period, Shares, Employee Stock Ownership Plan			3,000
Stock Issued During Period, Value, Employee Stock Ownership Plan			67
Accelerated Share-based Compensation Cost related to Severance Arrangements					865
Eligible Shares from Stock Options Granted related to Severance Arrangements					33,000			33,000
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings				429
Stock Options [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					3,499,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 18.14
Outstanding - Weighted Average Remaining Contractual Life					6 years 3 months 10 days
Exercisable - Options (in shares)					2,337,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 15.79
Exercisable - Weighted Average Remaining Contractual Life					5 years 0 months 14 days
Additional disclosure
Intrinsic value of vested options					39,326
Intrinsic value of outstanding options					30,712
Total unrecognized compensation expense related to non-vested employee options					19,665
Weighted average period for recognition of unrecognized compensation expense					2 years 1 month 20 days
Stock Options [Member] | $0.00 - $4.26 [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					28,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 3.50
Outstanding - Weighted Average Remaining Contractual Life					1 year 10 months 9 days
Exercisable - Options (in shares)					28,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 3.50
Exercisable - Weighted Average Remaining Contractual Life					1 year 10 months 9 days
Stock Options [Member] | $8.52 - $12.77 [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					0
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 0.00
Exercisable - Options (in shares)					0
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 0.00
Stock Options [Member] | $12.77- $17.03 [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					346,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 10.06
Outstanding - Weighted Average Remaining Contractual Life					4 years 4 months 20 days
Exercisable - Options (in shares)					342,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 10.06
Exercisable - Weighted Average Remaining Contractual Life					4 years 4 months 9 days
Stock Options [Member] | $38.32 - $42.58 [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					2,276,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 15.12
Outstanding - Weighted Average Remaining Contractual Life					5 years 8 months 4 days
Exercisable - Options (in shares)					1,785,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 15.19
Exercisable - Weighted Average Remaining Contractual Life					4 years 11 months 15 days
Stock Options [Member] | Exercise Price Range, Range Seven [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					77,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 28.47
Outstanding - Weighted Average Remaining Contractual Life					7 years 5 months 8 days
Exercisable - Options (in shares)					19,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 28.55
Exercisable - Weighted Average Remaining Contractual Life					7 years 2 months 19 days
Stock Options [Member] | Exercise Price Range, Range Eight [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					311,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 33.23
Outstanding - Weighted Average Remaining Contractual Life					8 years 3 months
Exercisable - Options (in shares)					123,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 33.23
Exercisable - Weighted Average Remaining Contractual Life					7 years 3 months 14 days
Stock Options [Member] | Exercise Price Range, Range Nine [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					0
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 0.00
Exercisable - Options (in shares)					0
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 0
Stock Options [Member] | Exercise Price Range, Range Five [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					77,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 19.90
Outstanding - Weighted Average Remaining Contractual Life					9 years 5 months 4 days
Exercisable - Options (in shares)					0
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 0
Stock Options [Member] | Exercise Price Range, Range Ten [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					143,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 39.95
Outstanding - Weighted Average Remaining Contractual Life					8 years 10 months 6 days
Exercisable - Options (in shares)					40,000
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 40.18
Exercisable - Weighted Average Remaining Contractual Life					8 years 7 months 20 days
Exercise Price Range, Range Six [Member] | $38.32 - $42.58 [Member]
Options outstanding and exercisable
Outstanding - Options (in shares)					241,000
Outstanding - Weighted Average Exercise Price (in dollars per share)					$ 23.74
Outstanding - Weighted Average Remaining Contractual Life					9 years 8 months 23 days
Exercisable - Options (in shares)					0
Exercisable - Weighted Average Exercise Price (in dollars per share)					$ 0
Restricted Stock Units [Member]
Additional disclosure
Intrinsic value of vested options					5
Total unrecognized compensation expense related to non-vested employee options					$ 5
Weighted average period for recognition of unrecognized compensation expense					1 year 11 months 15 days