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Stock-Based Compensation (Summary of Activity Relating to Restricted Units) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Restricted Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Purchase price for restricted units, vested $ 0.001nuan_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedSharesPurchasePrice
/ us-gaap_AwardTypeAxis
= nuan_RestrictedStockAwardsMember
Restricted Units, Outstanding [Roll Forward]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (250,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nuan_RestrictedStockAwardsMember
Outstanding at December 31, 2014 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nuan_RestrictedStockAwardsMember
Number of Shares Underlying Restricted Units — Contingent Awards  
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2014 5,726,385us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Granted 1,203,455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (1,847,551)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Forfeited (549,814)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Outstanding at December 31, 2014 4,532,475us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted average remaining recognition period of outstanding Restricted Units 1 year 9 months
Unearned stock-based compensation expense of outstanding Restricted Units $ 61.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Aggregate intrinsic value of outstanding Restricted Units(a) 64.7nuan_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Number of Shares Underlying Restricted Units — Time-Based Awards  
Restricted Units, Outstanding [Roll Forward]  
Outstanding at September 30, 2014 8,349,107us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Granted 5,057,637us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (4,629,094)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Forfeited (159,278)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Outstanding at December 31, 2014 8,618,372us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Weighted average remaining recognition period of outstanding Restricted Units 1 year 9 months
Unearned stock-based compensation expense of outstanding Restricted Units 100.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember
Aggregate intrinsic value of outstanding Restricted Units(a) $ 123.1nuan_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= nuan_TimeLapseRestrictedUnitsMember