Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
OPERATING ACTIVITIES:      
Net loss $ (60,725) $ (182,257) $ (39,142)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation and amortization 71,271 71,287 71,746
Noncash interest expense 10,222 8,761 7,471
Loss on disposition and retirement of fixed assets 374 93 1,306
Inventory fair value adjustment   2,889 1,745
Loss on extinguishment of debt     9,111
Asset impairment loss   160,150 3,500
Provision (recoveries) for doubtful accounts 970 (1,666) 203
Share-based compensation expense 2,087 1,512 1,423
Deferred income taxes 12,127 (21,059) (28,573)
Change in fair value of contingent consideration 0 (4,638) 104
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable, trade (5,614) 2,154 7,665
Income taxes 111 (179) 1,976
Inventories (3,097) (15,589) (9,774)
Other assets (340) (1,301) 105
Accounts payable (1,375) 1,700 (305)
Deferred revenue 64 413 (651)
Accrued expenses and other liabilities (485) 3,331 (3,376)
Cash provided by operating activities 25,590 25,601 24,534
INVESTING ACTIVITIES:      
Purchases of property and equipment (11,393) (9,193) (9,639)
Receipt from acquisition of business related to finalizing certain working capital adjustments   1,151  
Other investments (5,300)    
Acquisitions of businesses, net of cash acquired (6,396) (17,151) (84,762)
Cash used in investing activities (23,089) (25,193) (94,401)
FINANCING ACTIVITIES:      
Proceeds from long-term debt     338,076
Proceeds from capital contributions, net of costs     42,500
Payment of debt issuance costs     (11,412)
Repayments of long-term debt (6,653) (6,674) (288,332)
Proceeds from Revolving Facility 55,500   49,000
Repayments of Revolving Facility (55,500)   (49,000)
Cash (used in) provided by financing activities (6,653) (6,674) 80,832
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS (1,106) 499 (155)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (5,258) (5,767) 10,810
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 23,621 29,388 18,578
CASH AND CASH EQUIVALENTS AT END OF PERIOD 18,363 23,621 29,388
SUPPLEMENTAL INFORMATION:      
Income taxes paid, net of refunds 4,571 5,423 4,161
Interest paid 79,218 79,762 85,033
NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Movement from inventory to property and equipment of instruments placed on rental agreements 8,670 10,383 12,037
Fair value of contingent consideration liabilities at the date of acquisition $ 6,469 $ 11,300 4,400
Tax benefit from tax deductions contributed by IVD Holdings Inc.     726
August 2012 [Member]      
NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Exchange of debt instruments due to debt amendment     468,241
February 2013 [Member]      
NON-CASH INVESTING AND FINANCING ACTIVITIES:      
Exchange of debt instruments due to debt amendment     $ 467,406