Fair Values of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2011

Fair Values of Financial Instruments (Tables) [Abstract]

Carrying amounts and estimated fair values of financial instruments, including financial instruments not qualifying as hedge

									Thousands of
	Millions of yen								U.S. dollars
	2011				2010				2011
	Carrying		Estimated		Carrying		Estimated		Carrying		Estimated
	amount		fair value		amount		fair value		amount		fair value
Investment securities, marketable equity securities	¥	49,372	¥	49,372	¥	47,178	¥	47,178	$	594,843	$	594,843
Long-term debt, including current portion		413,760		412,375		462,941		460,916		4,985,060		4,968,373
Derivatives:
Forward and options
Assets		423		423		181		181		5,096		5,096
Liabilities		2,968		2,968		2,078		2,078		35,759		35,759
Interest rate swaps, cross-currency swap and interest rate cap agreements
Assets		10,608		10,608		9,172		9,172		127,808		127,808
Liabilities		1,008		1,008		2,550		2,550		12,145		12,145