Acquisitions (Tables)

12 Months Ended

Apr. 30, 2012

Acquisitions [Abstract]

Allocation Of Purchase Price

Assets acquired:
Inventories	$	2,947
Property and equipment		20,415
Total assets		23,362
Liabilities assumed:
Accrued expenses		282
Total liabilities		282
Net tangible assets acquired		23,080
Goodwill		16,364
Total consideration paid	$	39,444

Pro Forma Information Of Consolidated Results Of Operations

		Years Ended April 30,
		2012	2011
Total revenue	$	7,021,256	5,790,215
Net earnings	$	117,727	99,138
Earnings per common share
Basic	$	3.09	2.34
Diluted	$	3.07	2.33