Accounting Policies (Details) (USD $) In Millions, unless otherwise specified		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012 Other (Gains) Expenses, Net [Member]
Accounting Policies [Line Items]
Intellectual property assets transaction value		$ 35
Accounting Policies (Textual) [Abstract]
Percentage of cash and cash equivalents held by the Company's foreign subsidiaries outside the United States	59.00%