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Liability for Pension and Other Retirement Benefits (Details 3) (Pension Plans, Defined Benefit [Member]) In Thousands	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)
Other changes in plan assets and benefit obligations
Current year actuarial loss (gain)	$ 50,795	¥ 4,216,000	¥ (3,829,000)
Amortization of actuarial loss	(27,386)	(2,273,000)	(2,450,000)
Current year prior service cost	4,193	348,000	208,000
Amortization of prior service cost	(2,735)	(227,000)	(179,000)
Total	$ 24,867	¥ 2,064,000	¥ (6,250,000)

The pretax cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that occurred during the period. The cost has not yet been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased (decreased) benefits based on services rendered in prior periods.

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- Definition

Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

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