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Deferred Revenue (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Current deferred revenue $ 343,651us-gaap_DeferredRevenueCurrent $ 298,225us-gaap_DeferredRevenueCurrent
Long-term deferred revenue 294,154us-gaap_DeferredRevenueNoncurrent 249,879us-gaap_DeferredRevenueNoncurrent
Deferred maintenance revenue    
Current deferred revenue 150,983us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_MaintenanceRevenueMember		 140,737us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_MaintenanceRevenueMember
Long-term deferred revenue 58,412us-gaap_DeferredRevenueNoncurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_MaintenanceRevenueMember		 60,398us-gaap_DeferredRevenueNoncurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_MaintenanceRevenueMember
Unearned revenue    
Current deferred revenue 192,668us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_UnearnedRevenueMember		 157,488us-gaap_DeferredRevenueCurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_UnearnedRevenueMember
Long-term deferred revenue $ 235,742us-gaap_DeferredRevenueNoncurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_UnearnedRevenueMember		 $ 189,481us-gaap_DeferredRevenueNoncurrent
/ us-gaap_DeferredRevenueArrangementTypeAxis
= nuan_UnearnedRevenueMember