Note 10 - Commitments and Contingencies (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
SiteContingencyNumberOfSitesWithHazardousSubstances		8
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 18
Loss Contingency, Estimate of Possible Loss		67
Surety Bond [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		27
Junior DIP Facility [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		127
Bank Guarantee and Letter of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		11
Cash and Investment In Trust [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 33