Interests in subsidiaries (Details) - Mar. 31, 2015	USD ($)	CNY (¥)
Bonso Electronics Limited
Place of incorporation and kind of legal entity	Hong Kong, limited liability company
Particulars of issued capital/ registered capital		¥ 641,026
Particulars of issued capital/ registered capital HK$ \| $	$ 5,000,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Investment holding, providing management and administrative support to the Group companies
Bonso Investment Limited
Place of incorporation and kind of legal entity	Hong Kong, limited liability company
Particulars of issued capital/ registered capital		¥ 384,615
Particulars of issued capital/ registered capital HK$ \| $	$ 3,000,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Investment holding
Bonso Electronics (Shenzhen) Company, Limited
Place of incorporation and kind of legal entity	PRC, limited liability company
Particulars of issued capital/ registered capital		¥ 12,621,222
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Investment holding
Bonso Advanced Technology Limited
Place of incorporation and kind of legal entity	Hong Kong, limited liability company
Particulars of issued capital/ registered capital		¥ 128,205
Particulars of issued capital/ registered capital HK$		¥ 1,000,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Investment holding, and trading of scales and pet electronics products
Bonso AdvancedTtechnology (Xinxing) Company, Limited
Place of incorporation and kind of legal entity	PRC, limited liability company
Particulars of issued capital/ registered capital		¥ 10,000,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Production of scales and pet electronics products
Bonso Technology (Shenzhen) Company, Limited
Place of incorporation and kind of legal entity	PRC, limited liability company
Particulars of issued capital/ registered capital		¥ 200,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Product development
Xinxing An Bang Metal and Plastic Manufacturing Company Limited
Place of incorporation and kind of legal entity	PRC, limited liability company
Particulars of issued capital/ registered capital		¥ 500,000
Percentage of capital held by the Company	100.00%	100.00%
Principal activities	Employ workers for assembly of scales and pet electronics products

Description of activities of the subsidiary.

No definition available.

Name:	BNSO_DescriptionOfActivitiesOfSubsidiary
Namespace Prefix:	BNSO_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Additional paid-in capital or capital in CYN dollars or from other sources not otherwise defined. Use this element if the registrant wishes to distinguish between Additional paid-in capital from Other Additional Capital. The following adjustments are some examples of Other Additional Capital: recording the issuance of debt issued with a beneficial conversion feature, the issuance of convertible debt at a substantial premium, certain tax consequences of equity instruments awarded to employees, and accounting for certain expenses and liabilities paid for by the principal shareholder.

+ References

No definition available.

+ Details

Name:	BNSO_OtherAdditionalCapital1
Namespace Prefix:	BNSO_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Place of incorporation

+ References

No definition available.

+ Details

Name:	BNSO_PlaceOfIncorporationAndKindOfLegalEntity
Namespace Prefix:	BNSO_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Additional paid-in capital or capital from other sources not otherwise defined. Use this element if the registrant wishes to distinguish between Additional paid-in capital from Other Additional Capital. The following adjustments are some examples of Other Additional Capital: recording the issuance of debt issued with a beneficial conversion feature, the issuance of convertible debt at a substantial premium, certain tax consequences of equity instruments awarded to employees, and accounting for certain expenses and liabilities paid for by the principal shareholder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.30(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section T

+ Details

Name:	us-gaap_OtherAdditionalCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=BNSO_BELMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_BILMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_BESCLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_BATLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_BATXXCLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_BTLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=BNSO_ANBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: