Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Loss Contingencies [Line Items]
Self Insurance Medical Claims Coverage Ceiling per employee	$ 0.2
Self insurance Workers' Comp Coverage Ceiling per accident	1.0
Self Insurance General Liability Claims Coverage Ceiling per occurence	4.0
Self Insurance Auto Liabiity Coverage Ceiling per accident	$ 4.0