Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
OPERATING ACTIVITIES:
Net loss	$ (27,673)	$ (53,997)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	51,417	53,843
Noncash interest expense	8,178	7,557
Loss on disposition and retirement of fixed assets	526	237
Provision for doubtful accounts	456	372
Share-based compensation expense	4,045	1,800
Deferred income taxes	(16,953)	21,496
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, trade	6,774	(9,259)
Income taxes	(495)	526
Inventories	(11,034)	(6,017)
Other assets	1,477	1,101
Accounts payable	4,165	(3,284)
Deferred revenue	(20)	129
Accrued expenses and other liabilities	(14,022)	(11,712)
Cash provided by operating activities	6,841	2,792
INVESTING ACTIVITIES:
Purchases of property and equipment	(7,050)	(7,519)
Other investments	(4,850)	(5,300)
Acquisitions of businesses, net of cash acquired	(750)	(6,396)
Cash used in investing activities	(12,650)	(19,215)
FINANCING ACTIVITIES:
Repayments of long-term debt	(4,982)	(4,993)
Proceeds from Revolving Facility	48,000	49,500
Repayments of Revolving Facility	(43,500)	(36,500)
Cash (used in) provided by financing activities	(482)	8,007
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	118	(3,714)
DECREASE IN CASH AND CASH EQUIVALENTS	(6,173)	(12,130)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	18,363	23,621
CASH AND CASH EQUIVALENTS AT END OF PERIOD	12,190	11,491
SUPPLEMENTAL INFORMATION:
Income taxes paid, net of refunds	3,232	2,621
Interest paid	70,275	70,657
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Movement from inventory to property and equipment of instruments placed on rental agreements	4,552	$ 5,728
Non-cash dividend	$ 6,000