2.2.0.25truefalse070 - Statement - Estimated Future Collections Below, as of September 30, 2009, are Net of Allowances for Notes of $19 (Detail)truefalseIn Millionsfalse1falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections2011 [Member] 9/30/2011 USD ($) $c198_AsOf30Sep2011_ReceivableCollections2011Memberhttp://www.sec.gov/CIK0000353944instant2011-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections2011 [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollections2011Memberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections2012 [Member] 9/30/2012 USD ($) $c199_AsOf30Sep2012_ReceivableCollections2012Memberhttp://www.sec.gov/CIK0000353944instant2012-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections2012 [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollections2012Memberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections2013 [Member] 9/30/2013 USD ($) $c200_AsOf30Sep2013_ReceivableCollections2013Memberhttp://www.sec.gov/CIK0000353944instant2013-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections2013 [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollections2013Memberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections2014 [Member] 9/30/2014 USD ($) $c201_AsOf30Sep2014_ReceivableCollections2014Memberhttp://www.sec.gov/CIK0000353944instant2014-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections2014 [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollections2014Memberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections2015 [Member] 9/30/2015 USD ($) $c203_AsOf30Sep2015_ReceivableCollections2015Memberhttp://www.sec.gov/CIK0000353944instant2015-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections2015 [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollections2015Memberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{igt_EstimatedFutureReceivablesAxis} : Receivable Collections Total [Member] 9/30/2010 USD ($) $c202_AsOf30Sep2010_ReceivableCollectionsTotalMemberhttp://www.sec.gov/CIK0000353944instant2010-09-30T00:00:000001-01-01T00:00:00falsefalseReceivable Collections Total [Member]igt_EstimatedFutureReceivablesAxisxbrldihttp://xbrl.org/2006/xbrldiigt_ReceivableCollectionsTotalMemberigt_EstimatedFutureReceivablesAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_NotesReceivableNetus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse5380000053.8falsetruefalsetruefalse2truefalsefalse3780000037.8falsetruefalsetruefalse3truefalsefalse3560000035.6falsetruefalsetruefalse4truefalsefalse79000007.9falsetruefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6truefalsefalse135100000135.1[1]falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryFor an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 falsefalseNotes (1)3false0us-gaap_ContractsReceivableus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse130300000130.3falsefalsefalsetruefalse2truefalsefalse5500000055.0falsefalsefalsetruefalse3truefalsefalse2330000023.3falsefalsefalsetruefalse4truefalsefalse1200000012.0falsefalsefalsetruefalse5truefalsefalse3000000.3falsefalsefalsetruefalse6truefalsefalse220900000220.9[2]falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAmounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. Such amounts may be billed or unbilled depending on the specifics of the contract.No authoritative reference available.falsefalseContracts (2)4false0igt_NotesAndContractsReceivableNetigtfalsenainstantCurrent and non-current amount representing an agreement for an unconditional promise by the maker to pay the Company...falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse184100000184.1falsetruefalsetruefalse2truefalsefalse9280000092.8falsetruefalsetruefalse3truefalsefalse5890000058.9falsetruefalsetruefalse4truefalsefalse1990000019.9falsetruefalsetruefalse5truefalsefalse3000000.3falsetruefalsetruefalse6truefalsefalse356000000356.0falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryCurrent and non-current amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.No authoritative reference available.falsefalse[NotesAndContractsReceivableNet]1Net of allowances for doutful notes of $13.3 million.2Net of allowances for doubtful contracts of $65.1 million.63Estimated Future Collections Below, as of September 30, 2009, are Net of Allowances for Notes of $19 (Detail) (USD $)HundredThousandsUnKnownUnKnownUnKnownfalsetrue