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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Cash flows from operating activities:    
Net income (loss) $ (1,119) $ 1,808
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 14,420 13,999
Stock based compensation 2,860 2,901
Change in fair value of contingent consideration 661 1,418
Deferred income taxes (607) 3,685
Loss on disposal of long-lived assets 238 0
Impairment loss on fixed and other long-term assets 384 0
Change in accounts receivable allowances 338 345
Other (261) (89)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 4,908 3,069
Inventories (3,473) (14,081)
Prepaid expenses and other assets (1,600) (3,712)
Accounts payable, accrued and other liabilities (2,471) (6,138)
Net cash provided by operating activities 14,278 3,205
Cash flows from investing activities:    
Additions to property, plant and equipment (1,168) (7,523)
Acquisition of intangibles 0 (250)
Proceeds from sale or maturity of marketable securities 25 0
Net cash used in investing activities (1,143) (7,773)
Cash flows from financing activities:    
Proceeds from issuance of and borrowings on long-term debt 0 15,000
Repayment of long-term debt (3,750) (2,500)
Payment of contingent consideration previously established in purchase accounting (9,850) (11,222)
Proceeds from exercise of stock options and employee stock purchase plan 1,230 2,103
Net cash provided by (used in) financing activities (12,370) 3,381
Effect of exchange rate changes on cash and cash equivalents (160) (41)
Increase (decrease) in cash and cash equivalents 605 (1,228)
Cash and cash equivalents at beginning of period 18,391 16,105
Cash and cash equivalents at end of period 18,996 14,877
Supplemental disclosure of non-cash investing and financing activities:    
Contractual obligations for acquisition of fixed assets $ 228 $ 54