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Equity Investments - Northstar Illinois (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Aug. 31, 2015 | Jun. 30, 2015
Northstar IL |  |
Schedule of Equity Method Investments [Line Items] |  |
Shortfall payment | $ 10.0 | $ 35.1

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- Definition Shortfall Payment + References No definition available. + Details
Name: | sgms_ShortfallPayment
Namespace Prefix: | sgms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=sgms_NorthstarLotteryGroupLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |