Great East Japan Earthquake (Details) (JPY ¥) In Millions	12 Months Ended
Mar. 31, 2011
Great East Japan Earthquake (Textuals) [Abstract]
Incremental losses and expenses including repair, removal and cleaning costs directly related to the damage caused by the disaster	¥ 10,897
Disposal or impairments of fixed assets	7,668
Other loss and expenses	11,821
Insurance policies for damages	13,000
Property and casualty [Member]
Great East Japan Earthquake (Textuals) [Abstract]
Recovery from insurance claim	¥ 10,841

Great East Japan Earthquake.

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- Definition

Insurance policies for damages.

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- Definition

Other loss and expenses including idle facility costs at manufacturing sites, and an additional provision for life insurance policy reserves.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 26
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 7, 25

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

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The gross gain or loss income statement effect of each material event or transaction that is abnormal or significantly different from typical activities or is not reasonably expect to recur in the foreseeable future; but not both, and therefore does not meet both criteria for classification as an extraordinary item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26

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