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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Cash flows from operating activities:    
Net income $ 1,425 $ 7,053
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,884 5,529
Amortization of deferred loan costs 117 56
Foreign currency loss 493 181
Deferred income taxes 1,435 271
Loss on asset disposal 44 34
Loss on contingent consideration revaluation 522  
Non-cash compensation cost 1,205 975
(Increase) decrease:    
Receivables 23,173 4,477
Inventory (930) (777)
Prepaid expenses and other current assets (1,264) (649)
Increase (decrease):    
Accounts payable (10,369) (299)
Other accrued liabilities (10,336) (10,408)
Income taxes (3,583) (1,575)
Net cash provided by operating activities 9,816 4,868
Cash flows from investing activities:    
Capital expenditures (11,218) (5,468)
Business acquisitions, net of cash acquired (263,560) (2,151)
Restricted cash (5,000)  
Proceeds from sale of assets 5,137  
Decrease in other assets, net 23 272
Net cash used in investing activities (274,618) (7,347)
Cash flows from financing activities:    
Net borrowings (payments) under revolving credit agreement 280,340 (2,010)
Deferred consideration payments (369)  
Contingent consideration payments (230)  
Purchase of non-controlling interest (5,934)  
Debt issuance costs (1,950)  
Corporate tax effect from share-based payment arrangements   915
Issuance of common stock from share-based payment arrangements 476 892
Net cash provided by (used in) financing activities 272,333 (203)
Effect of exchange rate changes on cash (766) (496)
Net increase (decrease) in cash and cash equivalents 6,765 (3,178)
Cash and cash equivalents at beginning of period 33,211 34,656
Cash and cash equivalents at end of period $ 39,976 $ 31,478