Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014
Cash flows from operating activities:
Net income	$ 12,917	$ 24,613
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,542	11,164
Amortization of deferred loan costs	186	112
Foreign currency loss	624	816
Deferred income taxes	1,520	(1,052)
Loss on asset disposal	53	103
Loss on contingent consideration revaluation	522
Non-cash compensation cost	2,965	2,465
(Increase) decrease, net of the effect of acquisitions:
Receivables	(12,961)	(41,509)
Inventory	(132)	(1,253)
Prepaid expenses and other current assets	(887)	(737)
Increase (decrease), net of the effect of acquisitions:
Accounts payable	(4,172)	6,358
Other accrued liabilities	432	4,687
Income taxes	(4,177)	3,371
Net cash provided by operating activities	13,432	9,138
Cash flows from investing activities:
Capital expenditures	(21,797)	(11,425)
Business acquisitions, net of cash acquired	(262,191)	(2,949)
Restricted cash	(5,000)
Proceeds from sale of assets	5,225	35
Decrease in other assets, net	8	288
Net cash used in investing activities	(283,755)	(14,051)
Cash flows from financing activities:
Net borrowings under revolving credit agreement	293,000	13,000
Deferred consideration payments	(1,248)	(1,000)
Contingent consideration payments	(230)
Purchase of non-controlling interest	(5,934)
Debt issuance costs	(1,950)
Corporate tax effect from share-based payment arrangements	374	1,499
Issuance of common stock from share-based payment arrangements	2,325	1,290
Payments related to withholding tax for share-based payment arrangements	(1,375)	(1,735)
Net cash provided by financing activities	284,962	13,054
Effect of exchange rate changes on cash	(1,348)	(1,776)
Net increase in cash and cash equivalents	13,291	6,365
Cash and cash equivalents at beginning of period	33,211	34,656
Cash and cash equivalents at end of period	$ 46,502	$ 41,021