Commitments and Contingencies (Tables)

12 Months Ended

May 31, 2012

Commitments and Contingencies

Schedule of future minimum payments under operating leases

Year	Facilities and Equipment
2013	$	28,155
2014		23,449
2015		18,789
2016		11,588
2017		9,423
2018 and thereafter		46,295

Schedule of rental expense

	For the Year Ended May 31,
	2012		2011		2010
Facilities and Equipment	$	30,328	$	27,853	$	23,232
Aviation Equipment		—		—		792