Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Income Taxes (Textual) [Abstract]
Effective tax rate	33.60%	34.10%	33.70%	33.70%
Time period over which it is reasonably possible that the Company could increase or decrease its unrecognized tax benefits			12 months
Amount unrecognized tax benefit could decrease in next 12 months	$ 700,000		$ 700,000