Consolidated Statements Of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2012		Apr. 30, 2011		Apr. 30, 2010
Consolidated Statements Of Earnings [Abstract]
Total revenue	$ 6,987,804		$ 5,635,240		$ 4,637,087
Cost of goods sold (exclusive of depreciation and amortization, shown separately below)	5,984,114		4,754,173		3,844,735
Gross profit	1,003,690	[1]	881,067	[1]	792,352
Operating expenses	688,431		607,628		526,291
Depreciation and amortization	96,552		82,355		73,546
Interest, net	35,192		28,497		10,933
Loss on early retirement of debt			11,350
Earnings before income taxes	183,515		151,237		181,582
Federal and state income taxes	66,724		56,614		64,620
Net earnings	$ 116,791		$ 94,623		$ 116,962
Earnings per common share
Basic	$ 3.07		$ 2.24		$ 2.30
Diluted	$ 3.04		$ 2.22		$ 2.29

[1] Gross profit is given before charge for depreciation and amortization and credit card fees.