Supplemental Cash Flow Information (Tables)

12 Months Ended

Mar. 31, 2011

Supplemental Cash Flow Information (Tables) [Abstract]

Additional cash flow information and noncash investing and financing activities

							Thousands of
	Millions of yen						U.S. dollars
	2011		2010		2009		2011
Additional cash flow information:
Interest paid	¥	6,367	¥	8,533	¥	14,403	$	76,711
Income taxes paid		46,227		9,797		111,508		556,952
Noncash investing and financing activities:
Capital lease obligations incurred	¥	2,244	¥	14,285	¥	29,762	$	27,036