Income Taxes - Additional Information (Details)	3 Months Ended		9 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Company's effective tax rate for continuing operations	(5.00%)	8.50%	(0.70%)	2.50%