Note 17 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	May 31, 2014	Feb. 28, 2014	May 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 11,491	$ 23,621	$ 26,028	$ 29,388
Accounts receivable, net	72,476	69,629
Inventories	47,060	49,151
Deferred income tax assets, current portion	8,141	8,251
Prepaid expenses and other current assets	10,612	12,582
Total current assets	149,780	163,234
PROPERTY AND EQUIPMENT, net	73,243	76,311
GOODWILL	842,849	851,563		1,003,463
OTHER INTANGIBLE ASSETS, net	664,398	692,870
DEFERRED FINANCING COSTS, net	28,118	33,116
OTHER ASSETS	11,853	7,320
Total assets	1,770,241	1,824,414
CURRENT LIABILITIES:
Accounts payable	11,936	15,665
Accrued interest and interest rate swap liability	8,106	19,605
Accrued expenses and other current liabilities	23,251	23,716
Income taxes payable	4,780	4,927
Deferred revenue, current portion	2,786	2,813
Current portion of long-term debt, net of debt discounts	17,500	4,591
Total current liabilities	68,359	71,317
LONG-TERM DEBT, net of debt discounts	1,034,233	1,037,183
DEFERRED REVENUE	65	86
DEFERRED INCOME TAX LIABILITIES	249,398	223,379
OTHER LONG-TERM LIABILITIES	29,132	23,833
Total liabilities	1,381,187	1,355,798
SHAREHOLDERS' EQUITY:
Total shareholders' equity	389,054	468,616
Total liabilities and shareholders' equity	1,770,241	1,824,414
Consolidation, Eliminations [Member]
CURRENT ASSETS:
Intercompany receivable	(97,753)	(78,773)
Inventories	(2,120)	(2,124)
Deferred income tax assets, current portion	818	820
Total current assets	(99,055)	(80,077)
INVESTMENT IN SUBSIDIARIES	(233,636)	(267,702)
Total assets	(332,691)	(347,779)
CURRENT LIABILITIES:
Intercompany payable	(97,753)	(78,773)
Total current liabilities	(97,753)	(78,773)
Total liabilities	(97,753)	(78,773)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(234,938)	(269,006)
Total liabilities and shareholders' equity	(332,691)	(347,779)
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	1,666	4,863	4,654	6,971
Accounts receivable, net	33,375	29,558
Intercompany receivable	68,639	57,167
Inventories	21,644	20,733
Deferred income tax assets, current portion	4,160	4,160
Prepaid expenses and other current assets	4,475	6,228
Total current assets	133,959	122,709
PROPERTY AND EQUIPMENT, net	38,250	37,963
INVESTMENT IN SUBSIDIARIES	225,597	259,567
GOODWILL	744,149	743,512
OTHER INTANGIBLE ASSETS, net	569,118	586,243
DEFERRED FINANCING COSTS, net	28,118	33,116
OTHER ASSETS	11,240	6,721
Total assets	1,750,431	1,789,831
CURRENT LIABILITIES:
Accounts payable	5,814	6,805
Intercompany payable	2,059	99
Accrued interest and interest rate swap liability	8,106	19,605
Accrued expenses and other current liabilities	10,836	8,681
Income taxes payable	30,894	30,785
Deferred revenue, current portion	1,278	1,269
Current portion of long-term debt, net of debt discounts	17,493	4,580
Total current liabilities	76,480	71,824
LONG-TERM DEBT, net of debt discounts	1,034,231	1,037,168
DEFERRED REVENUE		14
DEFERRED INCOME TAX LIABILITIES	234,581	201,184
OTHER LONG-TERM LIABILITIES	16,085	11,025
Total liabilities	1,361,377	1,321,215
SHAREHOLDERS' EQUITY:
Total shareholders' equity	389,054	468,616
Total liabilities and shareholders' equity	1,750,431	1,789,831
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	(523)	(409)	(232)	4,107
Accounts receivable, net	5,853	5,137
Intercompany receivable	20,899	15,058
Inventories	15,518	17,358
Deferred income tax assets, current portion	2,807	2,807
Prepaid expenses and other current assets	797	470
Total current assets	45,351	40,421
PROPERTY AND EQUIPMENT, net	14,606	16,103
INVESTMENT IN SUBSIDIARIES	5,020	5,021
GOODWILL	47,640	47,877
OTHER INTANGIBLE ASSETS, net	60,242	63,474
OTHER ASSETS	257	260
Total assets	173,116	173,156
CURRENT LIABILITIES:
Accounts payable	2,630	5,945
Intercompany payable	86,991	69,999
Accrued expenses and other current liabilities	5,166	4,950
Income taxes payable	(29,967)	(29,698)
Deferred revenue, current portion	11	12
Current portion of long-term debt, net of debt discounts	7	11
Total current liabilities	64,838	51,219
LONG-TERM DEBT, net of debt discounts	2	15
DEFERRED INCOME TAX LIABILITIES	4,875	10,157
OTHER LONG-TERM LIABILITIES	11,787	11,425
Total liabilities	81,502	72,816
SHAREHOLDERS' EQUITY:
Total shareholders' equity	91,614	100,340
Total liabilities and shareholders' equity	173,116	173,156
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	10,348	19,167	21,606	18,310
Accounts receivable, net	33,248	34,934
Intercompany receivable	8,215	6,548
Inventories	12,018	13,184
Deferred income tax assets, current portion	356	464
Prepaid expenses and other current assets	5,340	5,884
Total current assets	69,525	80,181
PROPERTY AND EQUIPMENT, net	20,387	22,245
INVESTMENT IN SUBSIDIARIES	3,019	3,114
GOODWILL	51,060	60,174
OTHER INTANGIBLE ASSETS, net	35,038	43,153
OTHER ASSETS	356	339
Total assets	179,385	209,206
CURRENT LIABILITIES:
Accounts payable	3,492	2,915
Intercompany payable	8,703	8,675
Accrued expenses and other current liabilities	7,249	10,085
Income taxes payable	3,853	3,840
Deferred revenue, current portion	1,497	1,532
Total current liabilities	24,794	27,047
DEFERRED REVENUE	65	72
DEFERRED INCOME TAX LIABILITIES	9,942	12,038
OTHER LONG-TERM LIABILITIES	1,260	1,383
Total liabilities	36,061	40,540
SHAREHOLDERS' EQUITY:
Total shareholders' equity	143,324	168,666
Total liabilities and shareholders' equity	$ 179,385	$ 209,206