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Subsequent Event (Notes)	6 Months Ended
Subsequent Event (Notes)	Sep. 30, 2014
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 15, 2014, Hua Hong Semiconductor Limited (Hua Hong) effected its initial public offering on the Hong Kong Stock Exchange. The Company owns 27,964,822 shares of Hua Hong with a carrying value of $3.6 million as of September 30, 2014. The Company estimates its shares to be worth approximately $39.2 million based on the closing price of Hong Kong Dollar 10.88 per share (approximately US$1.40 per share) on 10/31/2014. The Company plans to classify this investment as an available-for-sale investment.