Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of the beginning and ending amount of unrecognized tax benefit:
Beginning of year	$ 41,523	$ 51,523
Increases for tax positions taken during current period	0	2,345
Decreases for currency fluctuation on tax positions	(849)	(3,037)
Decreases for settlements with taxing authorities	(4,083)	(3,197)
Decreases for lapse of the applicable statute of limitations	(1,629)	(6,111)
End of year	$ 34,962	$ 41,523