Restructuring initiatives	12 Months Ended
Mar. 31, 2017
Restructuring initiatives
Restructuring initiatives	14. Restructuring initiatives: During the year ended March 31, 2016, global markets have experienced extreme volatility and a significant decline in liquidity, triggered by heightened uncertainty in the global economy. Nomura’s management approved the restructuring of its Wholesale segment in EMEA and the Americas in March 2016. This restructuring will involve the closing of certain Wholesale businesses in EMEA and rationalizing existing businesses in the Americas in order to reduce costs, increase efficiencies and generate sustainable profitability within Nomura’s international operations in these regions. During the year ended March 31, 2017, this restructuring initiative is almost completed. As a result of this restructuring initiative, Nomura recognized ¥15,603 million of restructuring costs in the consolidated statements of income during the year ended March 31, 2016 which primarily relate to employee termination costs reported within Non-interest expenses—Compensation and benefits in the consolidated statements of income and within Nomura’s Wholesale segment. As of March 31, 2016, these costs are primarily reported as liabilities within Other liabilities in the consolidated statements of financial position. The amount of restructuring costs recognized in the consolidated statements of income during the year ended March 31, 2017 was not significant.

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Name:	us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration