2.2.0.25truefalse40104 - Disclosure - Note 1. Summary of Significant Accounting Policies (Summary of Membership Fee Activity) (Details)truefalseIn Millionsfalse1falsefalseUSDtruefalse{us-gaap_DeferredRevenueArrangementTypeAxis} : Membership Fee [Member]
2/1/2010 - 1/31/2011
USD ($)
$Duration_2_1_2010_To_1_31_20118http://www.sec.gov/CIK0000104169duration2010-02-01T00:00:002011-01-31T00:00:00falsefalseMembership Fee [Member]us-gaap_DeferredRevenueArrangementTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AnnualMembershipFeesMemberus-gaap_DeferredRevenueArrangementTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_DeferredRevenueArrangementTypeAxis} : Membership Fee [Member]
2/1/2009 - 1/31/2010
USD ($)
$Duration_2_1_2009_To_1_31_2010222http://www.sec.gov/CIK0000104169duration2009-02-01T00:00:002010-01-31T00:00:00falsefalseMembership Fee [Member]us-gaap_DeferredRevenueArrangementTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AnnualMembershipFeesMemberus-gaap_DeferredRevenueArrangementTypeAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDtruefalse{us-gaap_DeferredRevenueArrangementTypeAxis} : Membership Fee [Member]
2/1/2008 - 1/31/2009
USD ($)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A
falsefalse34Note 1. Summary of Significant Accounting Policies (Summary of Membership Fee Activity) (Details) (Membership Fee [Member], USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
