Subsequent Event (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Nov. 20, 2014 Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.290	$ 0.255	$ 0.580	$ 0.510	$ 0.315
Common Stock, Dividends, Per Share, Declared	$ 0.000	$ 0.000	$ 0.580	$ 0.510