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Employee Benefit Plan (Details) (Savings Plan [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2012
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Savings Plan [Member]
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| Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] | |||
| Defined contribution plan, percentage of employee's contributions matched by employer | 50.00% | ||
| Defined contribution plan, percentage of employer contribution on employee's earnings | 6.00% | ||
| Defined contribution plan, employers contribution, rate of vesting, percentage | 25.00% | ||
| Defined contribution plan, vesting period | 4 years | ||
| Matching contributions by employer | $ 5.1 | $ 5.0 | $ 4.9 |