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Leases - Types of lease assets under operating leases (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2019
Mar. 31, 2018
Operating Lease [Line Items]    
Cost ¥ 57,901 ¥ 28,042
Accumulated depreciation (1,808) (1,711)
Net carrying amount 56,093 26,331
Real estate [Member]    
Operating Lease [Line Items]    
Cost [1] 2,771 3,053
Accumulated depreciation [1] (1,498) (1,657)
Net carrying amount [1] 1,273 1,396
Aircraft [Member]    
Operating Lease [Line Items]    
Cost 55,130 24,989
Accumulated depreciation (310) (54)
Net carrying amount ¥ 54,820 ¥ 24,935
[1] Cost, accumulated depreciation and net carrying amounts include amounts relating to real estate space utilized by Nomura.