Commitments And Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Commitments And Contingencies [Abstract]
Payments of contractual and other claims	$ 5,000,000
Early estimates of the settlement and obligation amount	5,000,000			7,500,000
Provision for potential settlements of claims		2,500,000
Expected liability relating to lawsuits			10,000,000
Future minimum rental payments under noncancelable operating leases, fiscal 2012			15,900,000
Future minimum rental payments under noncancelable operating leases, fiscal 2013			11,800,000
Future minimum rental payments under noncancelable operating leases, fiscal 2014			11,100,000
Future minimum rental payments under noncancelable operating leases, fiscal 2015			9,600,000
Future minimum rental payments under noncancelable operating leases, fiscal 2016			9,100,000
Future minimum rental payments under noncancelable operating leases, thereafter			29,200,000
Operating leases, rent expense			23,200,000	21,900,000	18,900,000
Sublease income			0	100,000	100,000
Purchase under container supply agreement			32,500,000	22,600,000	26,300,000
Cumulative number of containers purchased under container supply agreement			1,072,000,000
Remaining minimum additional containers required to be purchased			348,000,000
Minimum future payment under container obligation			$ 1,500,000