2.2.0.25truefalse052 - Statement - Retrospective Application of Accounting Standards Adopted at the Beginning of Fiscal 2010 - Income Statement (including certain reclassifications for discontinued operations - see Note 7) (Detail)truefalseIn Millions, except Per Share datafalse1falsefalseUSDfalsefalse10/1/2008 - 9/30/2009 USD ($) USD ($) / shares $c1_From1Oct2008To30Sep2009http://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0ratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse10/1/2007 - 9/30/2008 USD ($) USD ($) / shares $c2_From1Oct2007To30Sep2008http://www.sec.gov/CIK0000353944duration2007-10-01T00:00:002008-09-30T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170ratioStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0igt_ConsolidatedIncomeStatementAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCONSOLIDATED INCOME STATEMENT3false0igt_InterestExpenseConsolidatedigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-159200000-159.2falsetruefalsefalsefalse2truefalsefalse-123300000-123.3falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseInterest expense4false0igt_OtherIncomeExpenseNetRetrospectiveApplicationigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-21400000-21.4falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther Income (expense), net5false0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse219300000219.3falsefalsefalsefalsefalse2truefalsefalse577600000577.6falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 falsefalseIncome from continuing operations before tax6false0us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse6680000066.8falsefalsefalsefalsefalse2truefalsefalse243300000243.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b falsefalseIncome tax provision7false0us-gaap_ProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse126800000126.8falsefalsefalsefalsefalse2truefalsefalse328000000328.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) falsefalseNet income8false0us-gaap_EarningsPerShareBasicus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse0.430.43falsetruefalsefalsefalse2truefalsefalse1.061.06falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 falsetrueBasic EPS (in Dollars per share)9false0us-gaap_EarningsPerShareDilutedus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse0.430.43falsetruefalsefalsefalse2truefalsefalse1.051.05falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 falsetrueDiluted EPS (in Dollars per share)10false0us-gaap_WeightedAverageNumberOfDilutedSharesOutstandingus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse294000000294.0falsefalsefalsefalsefalse2truefalsefalse310200000310.2falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 falsefalseDiluted weighted average shares outstanding (in Shares)11false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/retrospectiveapplicationofaccountingstandardsadoptedatthebeginningoffiscal2010incomestatementincludingcertainreclassificationsfordiscontinuedoperationsseenote7table1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse4falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : As Originally Reported [Member] 10/1/2008 - 9/30/2009 USD ($) USD ($) / shares $c60_From1Oct2008To30Sep2009_AsOriginallyReportedMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseigt_AsOriginallyReportedMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_AsOriginallyReportedMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0sharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$5falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : As Originally Reported [Member] 10/1/2007 - 9/30/2008 USD ($) / shares USD ($) $c64_From1Oct2007To30Sep2008_AsOriginallyReportedMemberhttp://www.sec.gov/CIK0000353944duration2007-10-01T00:00:002008-09-30T00:00:00falsefalseigt_AsOriginallyReportedMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_AsOriginallyReportedMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMembersharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseAs Originally Reported [Member]12true0igt_ConsolidatedIncomeStatementAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCONSOLIDATED INCOME STATEMENT13false0igt_InterestExpenseConsolidatedigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-129400000-129.4falsefalsefalsefalsefalse2truefalsefalse-100100000-100.1falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseInterest expense14false0igt_OtherIncomeExpenseNetRetrospectiveApplicationigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-15900000-15.9falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther Income (expense), net15false0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse238000000238.0falsefalsefalsefalsefalse2truefalsefalse590800000590.8falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 falsefalseIncome from continuing operations before tax16false0us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse8900000089.0falsefalsefalsefalsefalse2truefalsefalse248300000248.3falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b falsefalseIncome tax provision17false0us-gaap_ProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse149000000149.0falsefalsefalsefalsefalse2truefalsefalse342500000342.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) falsefalseNet income18false0us-gaap_EarningsPerShareBasicus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse0.510.51falsetruefalsefalsefalse2truefalsefalse1.111.11falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 falsetrueBasic EPS (in Dollars per share)19false0us-gaap_EarningsPerShareDilutedus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse0.510.51falsetruefalsefalsefalse2truefalsefalse1.101.10falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 falsetrueDiluted EPS (in Dollars per share)20false0us-gaap_WeightedAverageNumberOfDilutedSharesOutstandingus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse294500000294.5falsefalsefalsefalsefalse2truefalsefalse310400000310.4falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 falsefalseDiluted weighted average shares outstanding (in Shares)21false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/retrospectiveapplicationofaccountingstandardsadoptedatthebeginningoffiscal2010incomestatementincludingcertainreclassificationsfordiscontinuedoperationsseenote7table1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse6falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Retrospective Adjustments Covertible Debt [Member] 10/1/2008 - 9/30/2009 USD ($) USD ($) / shares $c61_From1Oct2008To30Sep2009_RetrospectiveAdjustmentsCovertibleDebtMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseigt_RetrospectiveAdjustmentsCovertibleDebtMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_RetrospectiveAdjustmentsCovertibleDebtMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$7falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Retrospective Adjustments Covertible Debt [Member] 10/1/2007 - 9/30/2008 USD ($) USD ($) / shares $c65_From1Oct2007To30Sep2008_RetrospectiveAdjustmentsCovertibleDebtMemberhttp://www.sec.gov/CIK0000353944duration2007-10-01T00:00:002008-09-30T00:00:00falsefalseigt_RetrospectiveAdjustmentsCovertibleDebtMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_RetrospectiveAdjustmentsCovertibleDebtMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseRetrospective Adjustments Covertible Debt [Member]22true0igt_ConsolidatedIncomeStatementAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCONSOLIDATED INCOME STATEMENT23false0igt_InterestExpenseConsolidatedigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-29900000-29.9falsefalsefalsefalsefalse2truefalsefalse-23200000-23.2falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseInterest expense24false0igt_OtherIncomeExpenseNetRetrospectiveApplicationigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-5200000-5.2falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther Income (expense), net25false0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-35100000-35.1falsefalsefalsefalsefalse2truefalsefalse-23200000-23.2falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 falsefalseIncome from continuing operations before tax26false0us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-12900000-12.9falsefalsefalsefalsefalse2truefalsefalse-8700000-8.7falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b falsefalseIncome tax provision27false0us-gaap_ProfitLossus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-22200000-22.2falsefalsefalsefalsefalse2truefalsefalse-14500000-14.5falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) falsefalseNet income28false0us-gaap_EarningsPerShareBasicus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-0.08-0.08falsetruefalsefalsefalse2truefalsefalse-0.05-0.05falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 falsetrueBasic EPS (in Dollars per share)29false0us-gaap_EarningsPerShareDilutedus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-0.08-0.08falsetruefalsefalsefalse2truefalsefalse-0.05-0.05falsetruefalsefalsefalseEPSus-types:perShareItemTypedecimalThe amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 falsetrueDiluted EPS (in Dollars per share)30false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/retrospectiveapplicationofaccountingstandardsadoptedatthebeginningoffiscal2010incomestatementincludingcertainreclassificationsfordiscontinuedoperationsseenote7table1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse8falsefalsetruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Retrospective Adjustments Participating Securities [Member] 10/1/2008 - 9/30/2009 c63_From1Oct2008To30Sep2009_RetrospectiveAdjustmentsParticipatingSecuritiesMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseigt_RetrospectiveAdjustmentsParticipatingSecuritiesMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_RetrospectiveAdjustmentsParticipatingSecuritiesMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMembersharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli09falsefalsetruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Retrospective Adjustments Participating Securities [Member] 10/1/2007 - 9/30/2008 c67_From1Oct2007To30Sep2008_RetrospectiveAdjustmentsParticipatingSecuritiesMemberhttp://www.sec.gov/CIK0000353944duration2007-10-01T00:00:002008-09-30T00:00:00falsefalseigt_RetrospectiveAdjustmentsParticipatingSecuritiesMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_RetrospectiveAdjustmentsParticipatingSecuritiesMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMembersharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0OthernaNo definition available.No authoritative reference available.falsefalseRetrospective Adjustments Participating Securities [Member]31true0igt_ConsolidatedIncomeStatementAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCONSOLIDATED INCOME STATEMENT32false0us-gaap_WeightedAverageNumberOfDilutedSharesOutstandingus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-500000-0.5falsefalsefalsefalsefalse2truefalsefalse-200000-0.2falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 falsefalseDiluted weighted average shares outstanding (in Shares)33false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://igt.com/role/retrospectiveapplicationofaccountingstandardsadoptedatthebeginningoffiscal2010incomestatementincludingcertainreclassificationsfordiscontinuedoperationsseenote7table1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse10falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Discontinued Operations Reclass [Member] 10/1/2008 - 9/30/2009 USD ($) $c62_From1Oct2008To30Sep2009_DiscontinuedOperationsReclassMemberhttp://www.sec.gov/CIK0000353944duration2008-10-01T00:00:002009-09-30T00:00:00falsefalseigt_DiscontinuedOperationsReclassMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_DiscontinuedOperationsReclassMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11falsefalseUSDtruefalse{igt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxis} : Discontinued Operations Reclass [Member] 10/1/2007 - 9/30/2008 USD ($) $c66_From1Oct2007To30Sep2008_DiscontinuedOperationsReclassMemberhttp://www.sec.gov/CIK0000353944duration2007-10-01T00:00:002008-09-30T00:00:00falsefalseigt_DiscontinuedOperationsReclassMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisxbrldihttp://xbrl.org/2006/xbrldiigt_DiscontinuedOperationsReclassMemberigt_RetropectiveApplicationOfAccountingStandardsOfIncomeStatementAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseDiscontinued Operations Reclass [Member]34true0igt_ConsolidatedIncomeStatementAbstractigtfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCONSOLIDATED INCOME STATEMENT35false0igt_InterestExpenseConsolidatedigtfalsedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1000000.1falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseInterest expense36false0igt_OtherIncomeExpenseNetRetrospectiveApplicationigtfalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-300000-0.3falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther Income (expense), net37false0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse1640000016.4falsefalsefalsefalsefalse2truefalsefalse1000000010.0falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetarySum of operating profit and nonoperating income (expense) before income (loss) from equity method investments, income taxes, extraordinary items, cumulative effects of changes in accounting principles, and noncontrolling interest.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 falsefalseIncome from continuing operations before tax38false0us-gaap_IncomeTaxExpenseBenefitus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-9300000-9.3falsetruefalsefalsefalse2truefalsefalse37000003.7falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph a, b falsefalseIncome tax provision237Retrospective Application of Accounting Standards Adopted at the Beginning of Fiscal 2010 - Income Statement (including certain reclassifications for discontinued operations - see Note 7) (Detail) (USD $)HundredThousandsHundredThousandsNoRoundingUnKnownfalsetrue