Equity (Schedule of Stock Options Activity) (Details) (USD $)	6 Months Ended
	Mar. 31, 2013
Number of Shares
Outstanding, beginning of period (in shares)	2,032,215
Granted (in shares)	35,400
Exercised (in shares)	(76,179)
Forfeited (in shares)	(44,088)
Expired (in shares)	(178,515)
Outstanding, end of period (in shares)	1,768,833
Exercisable as of September 30, 2012 (in shares)	1,456,747
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 17.76
Granted (in dollars per share)	$ 5.11
Exercised (in dollars per share)	$ 4.94
Forfeited (in dollars per share)	$ 7.66
Expired (in dollars per share)	$ 20.48
Outstanding, end of period (in dollars per share)	$ 18.04
Exercisable as of September 30, 2012 (in dollars per share)	$ 20.73
Weighted Average Remaining Contractual Life (in years):
Outstanding as of September 30, 2012	4 years 9 months 18 days
Exercisable as of September 30, 2012	4 years 2 months 9 days
Vested and Expected to Vest as of September 30, 2012
Number of stock options	1,731,105
Weighted average exercise price	$ 18.32
Weighted average remaining contractual term	4 years 8 months 19 days
Aggregate Intrinsic Value (in thousands)
Exercised	$ 92,000	[1]
Exercisable as of September 30, 2012	365,000	[1]
Vested and expected to vest as of September 30, 2012	634,000	[1]
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options,average minimum vesting period (in years)	4 years
Stock options, average maxmum vesting period (in years)	5 years
Stock options, contractual life (in years)	10 years
Unrecognized Stock-based Compensation Expense:
Unrecognized compensation expense	$ 800,000
Unrecognized compensation expense, period for recognition	2 years 2 months 12 days

[1] Intrinsic value for stock options represents the “in-the-money” portion or the positive variance between a stock option's exercise price and the underlying stock price.