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Consolidated Statements of Cash Flows (USD $)
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Cash flows from operating activities      
Net income $ 11,639,000 $ 21,346,000 $ 16,336,000
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 26,647,000 22,024,000 18,592,000
Deferred income taxes (1,732,000) (984,000) 1,779,000
Provision for doubtful accounts 379,000 479,000 253,000
Loss on extinguishment of long-term debt   (671,000)  
(Gain) loss on sale of assets (35,000) (90,000) 21,000
Amortization of deferred financing costs 125,000 147,000 169,000
Share-based compensation expense 6,285,000 5,097,000 3,751,000
Goodwill impairment 9,938,000    
Fair value adjustments to contingent consideration liabilities (3,727,000) 174,000  
Interest rate swap     (210,000)
Foreign currency loss (gain) 3,000 (508,000) (335,000)
Changes in operating assets and liabilities, net of effect of acquisitions      
Accounts receivable 4,772,000 (18,030,000) (22,664,000)
Inventories 525,000 (1,708,000) (77,000)
Prepaid expenses and other current assets (1,042,000) (1,503,000)  
Other assets 462,000 (8,000) 47,000
Accounts payable (5,478,000) 3,149,000 1,904,000
Accrued expenses and other liabilities (3,832,000) 5,524,000 6,203,000
Income taxes payable (1,426,000) (3,036,000) (515,000)
Net cash provided by operating activities 43,503,000 31,402,000 25,254,000
Cash flows from investing activities      
Purchase of property, plant and equipment (12,530,000) (9,592,000) (10,075,000)
Purchase of intangible assets (993,000) (813,000) (520,000)
Acquisition of businesses, net of cash acquired (33,122,000) (29,216,000) (26,195,000)
Proceeds from sale of equipment 1,166,000 2,109,000 312,000
Net cash used in investing activities (45,479,000) (37,512,000) (36,478,000)
Cash flows from financing activities      
Repayment of capital lease obligations (6,972,000) (6,984,000) (6,230,000)
Repayment of long-term debt (5,075,000) (12,346,000) (7,141,000)
Net (repayments) borrowings from former revolver   (3,850,000) 3,850,000
Net borrowings from current revolver 14,568,000 25,000,000  
Net (repayments) proceeds from other short-term borrowings   (1,868,000) 45,000
Payment of financing costs   (623,000)  
Proceeds from capital contribution from noncontrolling interests     21,000
Purchase of remaining noncontrolling interest in subsidiary   (75,000)  
Net proceeds from issuance of common stock     14,682,000
Payment of contingent consideration for business acquisitions (1,892,000)    
Taxes paid related to net share settlement of equity awards (809,000) (283,000)  
Excess tax benefit from share-based payment compensation 495,000 554,000 22,000
Proceeds from the exercise of stock options 829,000 2,484,000 95,000
Net cash provided by financing activities 1,144,000 2,009,000 5,344,000
Effect of exchange rate changes on cash and cash equivalents 224,000 1,632,000 722,000
Net change in cash and cash equivalents (608,000) (2,469,000) (5,158,000)
Cash and cash equivalents:      
Beginning of period 8,410,000 10,879,000 16,037,000
End of period 7,802,000 8,410,000 10,879,000
Supplemental disclosure of cash paid      
Interest 3,144,000 2,749,000 2,783,000
Income taxes 15,639,000 14,871,000 9,257,000
Noncash investing and financing      
Equipment acquired through capital lease obligations 3,886,000 9,504,000 6,403,000
Issuance of notes payable and other debt obligations primarily related to acquisitions $ 7,715,000 $ 3,340,000 $ 10,407,000