Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016
Operating activities:
Net loss	$ (32,277)	$ (27,673)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	54,072	51,417
Noncash interest expense	10,559	8,178
Loss on disposition and retirement of fixed assets	738	526
Provision for doubtful accounts	282	456
Share-based compensation expense	3,496	4,045
Deferred income taxes	(22,325)	(16,953)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, trade	(3,743)	6,774
Income taxes	695	(495)
Inventories	(8,293)	(11,034)
Other assets	(466)	1,477
Accounts payable	(779)	4,165
Deferred revenue	417	(20)
Accrued expenses and other liabilities	(8,875)	(14,022)
Cash (used in) provided by operating activities	(6,499)	6,841
Investing activities:
Purchases of property and equipment	(8,243)	(7,050)
Proceeds from sale of property and equipment	53
Other investments		(4,850)
Acquisitions of businesses, net of cash acquired	(128)	(750)
Cash used in investing activities	(8,318)	(12,650)
Financing activities:
Repayments of long-term debt	(5,122)	(4,982)
Proceeds from Revolving Facilities	85,500	48,000
Repayments of Revolving Facilities	(65,500)	(43,500)
Dividend payments	(7,680)
Proceeds from capital contribution to noncontrolling interest	7,300
Cash provided by (used in) financing activities	14,498	(482)
Effect of exchange rates on cash and cash equivalents	91	118
Decrease in cash and cash equivalents	(228)	(6,173)
Cash and cash equivalents at beginning of period	10,263	18,363
Cash and cash equivalents at end of period	10,035	12,190
Supplemental information:
Income taxes paid, net of refunds	2,197	3,232
Interest paid	69,934	70,275
Non-cash investing and financing activities:
Movement from inventory to property and equipment of instruments placed on rental agreements	5,789	4,552
Non-cash dividend		$ 6,000