PROPERTY, PLANT AND EQUIPMENT (Tables)

6 Months Ended

Nov. 30, 2014

Depreciation and amortization of assets are computed by the straight-line method over the following estimated useful lives of the assets:


Classification	Useful Life
Buildings		20-40 years
Leasehold improvements		2-15 years
Machinery and equipment		2-12 years
Furniture and fixtures		2-10 years
ERP system development costs		5-10 years
Computers and computer software		2-5 years
Automobiles		2-5 years

A summary of property, plant and equipment as of November 30, 2014 and May 31, 2014 is as follows (in thousands):


	November 30, 2014			May 31, 2014
	(unaudited)
Land	$	3,057		$	3,078
Buildings and leasehold improvements		27,109			26,793
Machinery and equipment		151,616			150,050
Furniture and fixtures		5,517			5,530
Capitalized ERP system development costs		8,357			4,655
Computers and computer software		6,800			6,842
Automobiles		3,299			3,550
Construction in progress		2,607			3,123

Total		208,362			203,621
Accumulated depreciation and amortization		(116,387	)		(113,660	)

Property, plant and equipment, net	$	91,975		$	89,961