Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Income Statement [Abstract]
Total revenue	$ 7,122,086	$ 7,767,216	$ 7,840,255
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	5,508,465	6,327,431	6,618,239
Gross profit	1,613,621	1,439,785	1,222,016
Operating expenses	1,053,805	960,424	857,297
Depreciation and amortization	170,937	156,111	131,160
Interest, net	40,173	41,225	39,915
Income before income taxes	348,706	282,025	193,644
Federal and state income taxes	122,724	101,397	66,824
Net income	$ 225,982	$ 180,628	$ 126,820
Net income per common share
Basic (in Dollars per share)	$ 5.79	$ 4.66	$ 3.30
Diluted (in Dollars per share)	$ 5.73	$ 4.62	$ 3.26