Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basis of Presentation and Significant Accounting Policies [Abstract]
Value added tax expense	$ 3,431	$ 3,975	$ 10,962	$ 9,122
Operating Income (Loss) [Member]
Basis of Presentation [Line Items]
Pretax Charge Resulting from Change in Estimate Related to Recoveries of Advances			$ 11,000