Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items]
Maximum annual contribution per employee percentage	25.00%
Matching contributions, amount	$ 1.4	$ 1.3	$ 1.3
Full Employer Match [Member]
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items]
Employers percent of matching contributions	100.00%
Percent of employees' gross pay for employer match	3.00%
Half Employer Match [Member]
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items]
Employers percent of matching contributions	50.00%
Percent of employees' gross pay for employer match	2.00%