2.2.0.25falsefalse078 - Statement - Recast Amounts are Relected in the Table Below (Detail)truefalseIn Millionsfalse1falsefalseUSDfalsefalse10/2/2009 - 9/30/2010 USD ($) $c284_From2Oct2009To30Sep2010http://www.sec.gov/CIK0000353944duration2009-10-02T00:00:002010-09-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDfalsefalse10/2/2008 - 9/30/2009 USD ($) $c285_From2Oct2008To30Sep2009http://www.sec.gov/CIK0000353944duration2008-10-02T00:00:002009-09-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDfalsefalse10/2/2007 - 9/30/2008 USD ($) $c286_From2Oct2007To30Sep2008http://www.sec.gov/CIK0000353944duration2007-10-02T00:00:002008-09-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2true0igt_RecastAmountsAreRelectedInTheTableBelowAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseRecast Amounts are Relected in the Table Below [Abstract]3false0igt_ContractualInterestExpenseigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse38000003.8falsetruefalsefalsefalse2truefalsefalse2010000020.1falsetruefalsefalsefalse3truefalsefalse2340000023.4falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual interest expense4false0igt_DiscountAmortizationRecastigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse27000002.7falsefalsefalsefalsefalse2truefalsefalse1990000019.9falsefalsefalsefalsefalse3truefalsefalse2360000023.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseDiscount amortization5false0igt_GainLossOnRepurchasesigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse13000001.3falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseGain (loss) on repurchases34Recast Amounts are Relected in the Table Below (Detail) (USD $)HundredThousandsUnKnownUnKnownUnKnownfalsetrue