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Commitments and Contingencies (Tables)
12 Months Ended
May. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments for All Noncancelable Leases
Future minimum lease payments for noncancelable operating leases at May 31, 2015 were as follows (in thousands):  
Fiscal years ending May 31:
 
 
2016
 
$
13,878

2017
 
11,089

2018
 
9,226

2019
 
7,760

2020
 
6,873

Thereafter
 
9,172

   Total future minimum lease payments
 
$
57,998