Reconciliation of Total Amounts of Unrecognized Tax Benefits Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits as of March 31, 2012	$ 11,780
Additions based on tax positions related to the current year	2,163
Reductions for tax positions of prior years	0
Settlements	(81)
Unrecognized tax benefits increase (decrease), total	2,082
Unrecognized tax benefits as of March 31, 2013	$ 13,862

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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