Inventories (Tables)

9 Months Ended

Apr. 30, 2012

Inventories [Abstract]

Schedule Of Major Classifications Of Inventories

	April 30, 2012		July 31, 2011
Raw materials	$	107,636	$	104,360
Chassis		34,996		46,548
Work in process		66,935		48,575
Finished goods		23,500		14,179
Total		233,067		213,662
Excess of FIFO costs over LIFO costs		(32,164)		(29,164)
Total inventories	$	200,903	$	184,498