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Commitments, Guarantees and Contingent Liabilities - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Commitments for purchase of equipment to be leased at cost	¥ 20,390
Total rental payments under operating lease agreements	10,055	7,848	7,681
Payments for computer systems under non-cancelable contracts	3,399	487	442
Longest non-cancelable contracts, maturity year	2020
Estimated construction costs	69,375
Total unused credit and capital amount available	295,079
Guarantee Obligations Maximum Exposure	694,542	622,292
Guarantee Obligations Current Carrying Value	23,960	22,481
Corporate Loans
Commitments and Contingencies Disclosure [Line Items]
Guarantee Obligations Maximum Exposure	349,435	316,650
Guarantee Obligations Current Carrying Value	3,577	2,587
Corporate Loans | Performance Guarantee
Commitments and Contingencies Disclosure [Line Items]
Guarantee Obligations Maximum Exposure	1,269,000	1,239,000
Guarantee Obligations Current Carrying Value	¥ 823	¥ 734

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Commitments Expiration, Year

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Amount of payments made reducing loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

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