Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Total revenue	$ 1,790,055	$ 1,662,365	$ 5,920,689	$ 5,442,311
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	1,510,182	1,412,679	4,973,005	4,626,338
Gross profit	279,873	249,686	947,684	815,973
Operating expenses	214,671	189,872	647,174	569,311
Depreciation and amortization	32,687	28,229	95,604	81,913
Interest, net	9,947	8,764	29,151	26,305
Income before income taxes	22,568	22,821	175,755	138,444
Federal and state income taxes	7,899	7,358	64,057	51,091
Net income	$ 14,669	$ 15,463	$ 111,698	$ 87,353
Net income per common share
Basic (in Dollars per share)	$ 0.38	$ 0.40	$ 2.91	$ 2.28
Diluted (in Dollars per share)	$ 0.38	$ 0.40	$ 2.87	$ 2.26
Basic weighted average shares outstanding (in Shares)	38,482,970	38,317,140	38,443,816	38,282,196
Plus effect of stock compensation (in Shares)	444,061	304,948	418,025	331,934
Diluted weighted average shares outstanding (in Shares)	38,927,031	38,622,088	38,861,841	38,614,130
Dividends declared per share (in Dollars per share)	$ 0.18	$ 0.165	$ 0.54	$ 0.495