Property and Equipment

12 Months Ended

May. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment

PROPERTY AND EQUIPMENT

As of May 31, 2015 and 2014, property and equipment consisted of the following:

	Range of Useful Lives (Years)	2015		2014
		(in thousands)
Land	N/A	$	1,571	$	1,942
Buildings	25-30	26,236		33,996
Equipment	2-10	197,186		204,102
Software	2-10	248,137		224,766
Leasehold improvements	3-15	20,458		19,399
Furniture and fixtures	3-7	3,705		3,809
Work in progress	N/A	56,782		53,704
		554,075		541,718
Less accumulated depreciation and amortization		179,932		171,965
		$	374,143	$	369,753

Total depreciation and amortization expense of property and equipment was $64.9 million, $60.1 million, and $55.0 million for the years ended May 31, 2015, 2014 and 2013, respectively.