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Leases - Types of lease assets under operating leases (Detail) - JPY (¥)
¥ in Millions
Sep. 30, 2018
Mar. 31, 2018
Operating Lease [Line Items]    
Cost ¥ 17,688 ¥ 28,042
Accumulated depreciation (1,835) (1,711)
Net carrying amount 15,853 26,331
Real estate [Member]    
Operating Lease [Line Items]    
Cost [1] 3,034 3,053
Accumulated depreciation [1] (1,694) (1,657)
Net carrying amount [1] 1,340 1,396
Aircraft [Member]    
Operating Lease [Line Items]    
Cost 14,654 24,989
Accumulated depreciation (141) (54)
Net carrying amount ¥ 14,513 ¥ 24,935
[1] Cost, accumulated depreciation and net carrying amounts include amounts relating to real estate utilized by Nomura.