Long-term Debt and Short-term Borrowings (Narrative) (Details) (JPY ¥) In Millions, unless otherwise specified	Mar. 31, 2011	Mar. 31, 2010
Long-term Debt and Short-term Borrowings
Other investments and advances, and property, plant and equipment pledged as collateral	¥ 8,945	¥ 9,933
Loans subject to collateral	¥ 3,899	¥ 6,761
Short-term borrowings, weighted-average interest rate	2.80%	2.50%

Reflects the calculation as of the balance-sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19
-Subparagraph b
-Article 5

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant