Equity (Schedule of Stock Options Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Number of Shares
Outstanding, beginning of period (in shares)	1,431,190
Granted (in shares)	9,650
Exercised (in shares)	(123,387)
Forfeited (in shares)	(8,027)
Expired (in shares)	(79,503)
Outstanding, end of period (in shares)	1,229,923
Exercisable as of March 31, 2015 (in shares)	1,210,320
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 19.06
Granted (in dollars per share)	$ 5.34
Exercised (in dollars per share)	$ 4.54
Forfeited (in dollars per share)	$ 5.12
Expired (in dollars per share)	$ 17.27
Outstanding, end of period (in dollars per share)	$ 20.62
Exercisable as of March 31, 2015	$ 20.86
Weighted Average Remaining Contractual Life (in years):
Outstanding as of March 31, 2015	2 years 0 months 29 days
Exercisable as of March 31, 2015	1 year 11 months 19 days
Vested and expected to vest as of March 31, 2015
Number of stock options	1,226,293
Weighted average exercise price	$ 20.66
Weighted average remaining contractual term	2 years 0 months 22 days
Aggregate Intrinsic Value (in thousands) (USD per share)
Exercised (USD per share)	$ 95	$ 4
Outstanding as of March 31, 2015	265
Exercisable as of March 31, 2015	258
Vested and expected to vest as of March 31, 2015	$ 264