Other residual Value Guarantee Amounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014
Scotts Lawn Service Vehicles
Property Subject to or Available for Operating Lease [Line Items]
Amount of Guarantee	$ 0.8
Lease Termination Date	Sep. 30, 2020
Corporate Aircraft
Property Subject to or Available for Operating Lease [Line Items]
Amount of Guarantee	$ 30.9