Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 7.6	$ 12.1

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

No definition available.