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9/30/2010 USD ($) USD ($) / shares $c401_From1Oct2009To30Sep2010_ThirdMemberhttp://www.sec.gov/CIK0000353944duration2009-10-01T00:00:002010-09-30T00:00:00falsefalseThird [Member]igt_QuarterAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ThirdMemberigt_QuarterAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$6falsefalseUSDtruefalse{igt_QuarterAxis} : Third [Member] 10/1/2008 - 9/30/2009 USD ($) USD ($) / shares $c405_From1Oct2008To30Sep2009_ThirdMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseThird [Member]igt_QuarterAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ThirdMemberigt_QuarterAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseThird [Member]18true0igt_a2010Abstract0igtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse201019false0igt_QuarterlyFinancialDataRevenueigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse489300000489.3falsefalsefalsefalsefalse2truefalsefalse516800000516.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseTotal revenues20false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse276100000276.1falsefalsefalsefalsefalse2truefalsefalse295500000295.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.falsefalseGross profit21false0igt_QuarterlyFinancialDataOperatingIncomeigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse122700000122.7falsefalsefalsefalsefalse2truefalsefalse128100000128.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOperating income22false0igt_QuarterlyFinancialDataIncomeFromContinuingOperationsigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse9740000097.4falsefalsefalsefalsefalse2truefalsefalse6300000063.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseIncome from continuing operations23false0igt_QuarterlyFinancialDataNetIncomeigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse9210000092.1falsefalsefalsefalsefalse2truefalsefalse6060000060.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseNet income24false0igt_QuarterlyFinancialDataDilutedEarningsPerShareigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse0.310.31falsetruefalsefalsefalse2truefalsefalse0.200.20falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalNo definition available.No authoritative reference available.falsetrueDiluted EPS (in Dollars per share)25false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/quarterlyfinancialdataunauditedtable1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse7falsefalseUSDtruefalse{igt_QuarterAxis} : Fourth [Member] 10/1/2009 - 9/30/2010 USD ($) USD ($) / shares $c402_From1Oct2009To30Sep2010_FourthMemberhttp://www.sec.gov/CIK0000353944duration2009-10-01T00:00:002010-09-30T00:00:00falsefalseFourth [Member]igt_QuarterAxisxbrldihttp://xbrl.org/2006/xbrldiigt_FourthMemberigt_QuarterAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$8falsefalseUSDtruefalse{igt_QuarterAxis} : Fourth [Member] 10/1/2008 - 9/30/2009 USD ($) USD ($) / shares $c406_From1Oct2008To30Sep2009_FourthMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseFourth [Member]igt_QuarterAxisxbrldihttp://xbrl.org/2006/xbrldiigt_FourthMemberigt_QuarterAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseFourth [Member]26true0igt_a2010Abstract0igtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse201027false0igt_QuarterlyFinancialDataRevenueigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse496000000496.0falsefalsefalsefalsefalse2truefalsefalse512300000512.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseTotal revenues28false0us-gaap_GrossProfitus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse276800000276.8falsefalsefalsefalsefalse2truefalsefalse290200000290.2falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.No authoritative reference available.falsefalseGross profit29false0igt_QuarterlyFinancialDataOperatingIncomeigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse102600000102.6falsefalsefalsefalsefalse2truefalsefalse3300000033.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOperating income30false0igt_QuarterlyFinancialDataIncomeFromContinuingOperationsigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse2580000025.8falsefalsefalsefalsefalse2truefalsefalse-10100000-10.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseIncome from continuing operations31false0igt_QuarterlyFinancialDataNetIncomeigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1990000019.9falsetruefalsefalsefalse2truefalsefalse-28600000-28.6falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseNet income32false0igt_QuarterlyFinancialDataDilutedEarningsPerShareigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse0.070.07falsetruefalsefalsefalse2truefalsefalse-0.10-0.10falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalNo definition available.No authoritative reference available.falsetrueDiluted EPS (in Dollars per share)232Quarterly Financial Data (Unaudited) (Detail) (USD $)HundredThousandsUnKnownNoRoundingUnKnownfalsetrue