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Income Taxes (Schedule Of Valuation Allowance) (Detail) (JPY ¥) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Income Taxes [Abstract]
Balance at beginning of year	¥ 986	¥ 1,509	¥ 1,631
Addition	753	447	391
Deduction	(905)	(970)	(513)
Addition from acquisition	3,066
Balance at end of year	¥ 3,900	¥ 986	¥ 1,509

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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