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Consolidated Statements Of Cash Flows
 6 Months Ended
Nov. 24, 2018
USD ($)
Nov. 25, 2017
USD ($)
Cash flows from operating activities:    
Net income $ 16,305,000 $ 10,250,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,173,000 2,209,000
Stock-based compensation expense 3,013,000 3,062,000
Contingent consideration adjustment (37,000)  
Loss on disposal of assets 64,000  
Bad debt expense 477,000 364,000
Deferred income taxes 4,620,000 (906,000)
Changes in operating assets and liabilities, net of effects of business combinations:    
Trade accounts receivable (17,838,000) (8,394,000)
Prepaid expenses and other current assets 205,000 (568,000)
Income taxes (3,102,000) 1,468,000
Other assets (1,042,000) 84,000
Accounts payable and accrued expenses (458,000) 1,245,000
Accrued salaries and related obligations (6,121,000) (5,943,000)
Other liabilities 1,406,000 (1,231,000)
Net cash provided by operating activities 1,665,000 1,640,000
Cash flows from investing activities:    
Proceeds from sale of property and equipment   1,000
Purchase of property and equipment (3,405,000) (784,000)
Net cash used in investing activities (3,408,000) (4,206,000)
Cash flows from financing activities:    
Proceeds from exercise of stock options 10,413,000 1,666,000
Proceeds from issuance of common stock under Employee Stock Purchase Plan 2,178,000 2,260,000
Purchase of common stock (13,002,000)  
Repayment on Revolving Credit Facility (5,000,000)  
Cash dividends paid (7,887,000) (6,833,000)
Net cash used in financing activities (13,298,000) (2,907,000)
Effect of exchange rate changes on cash (606,000) (572,000)
Net decrease in cash (15,647,000) (6,045,000)
Cash and cash equivalents at beginning of period 56,470,000 62,329,000
Cash and cash equivalents at end of period 40,823,000 56,284,000
Accretive [Member]    
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired (3,000)  
Taskforce [Member]    
Adjustments to reconcile net income to net cash provided by operating activities:    
Contingent consideration adjustment $ (33,000)  
Cash flows from investing activities:    
Acquisition of businesses, net of cash acquired   $ (3,423,000)