Note 21 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	May 31, 2014	May 31, 2013	May 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 23,621	$ 29,388	$ 18,578
Accounts receivable, net	69,629	68,086
Inventories	49,151	45,941
Deferred income tax assets, current portion	8,251	5,290
Prepaid expenses and other current assets	12,582	11,577
Total current assets	163,234	160,282
PROPERTY AND EQUIPMENT, net	76,311	76,381
GOODWILL	851,563	1,003,463	966,338
OTHER INTANGIBLE ASSETS, net	692,870	714,603
DEFERRED FINANCING COSTS, net	33,116	39,449
OTHER ASSETS	7,320	6,792
Total assets	1,824,414	2,000,970
CURRENT LIABILITIES:
Accounts payable	15,665	13,638
Accrued interest and interest rate swap liability	19,605	20,084
Accrued expenses and other current liabilities	23,716	26,654
Income taxes payable	4,927	3,873
Deferred revenue, current portion	2,813	2,252
Current portion of long-term debt, net of debt discounts	4,591	6,712
Total current liabilities	71,317	73,213
LONG-TERM DEBT, net of debt discounts	1,037,183	1,039,278
DEFERRED REVENUE	86	161
DEFERRED INCOME TAX LIABILITIES	223,379	231,040
OTHER LONG-TERM LIABILITIES	23,833	12,572
Total liabilities	1,355,798	1,356,264
SHAREHOLDERS' EQUITY:
Total shareholders' equity	468,616	644,706	637,378
Total liabilities and shareholders' equity	1,824,414	2,000,970
Consolidation, Eliminations [Member]
CURRENT ASSETS:
Intercompany receivable	(78,773)	(66,717)
Inventories	(2,124)	(1,485)
Deferred income tax assets, current portion	820	562
Total current assets	(80,077)	(67,640)
INVESTMENT IN SUBSIDIARIES	(255,702)	(253,897)
Total assets	(335,779)	(321,537)
CURRENT LIABILITIES:
Intercompany payable	(78,773)	(67,211)
Total current liabilities	(78,773)	(67,211)
Total liabilities	(78,773)	(67,211)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(257,006)	(254,326)
Total liabilities and shareholders' equity	(335,779)	(321,537)
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	4,863	6,971
Accounts receivable, net	29,558	26,517
Intercompany receivable	57,167	54,443
Inventories	20,733	18,551
Deferred income tax assets, current portion	4,160	3,098
Prepaid expenses and other current assets	6,228	6,360
Total current assets	122,709	115,940
PROPERTY AND EQUIPMENT, net	37,963	40,124
INVESTMENT IN SUBSIDIARIES	247,567	248,150
GOODWILL	743,512	903,802
OTHER INTANGIBLE ASSETS, net	586,243	634,194
DEFERRED FINANCING COSTS, net	33,116	39,449
OTHER ASSETS	6,721	6,203
Total assets	1,777,831	1,987,862
CURRENT LIABILITIES:
Accounts payable	6,805	7,587
Intercompany payable	99	424
Accrued interest and interest rate swap liability	19,605	20,084
Accrued expenses and other current liabilities	8,681	11,653
Income taxes payable	30,785	30,879
Deferred revenue, current portion	1,269	1,086
Current portion of long-term debt, net of debt discounts	4,580	6,673
Total current liabilities	71,824	78,386
LONG-TERM DEBT, net of debt discounts	1,037,168	1,039,250
DEFERRED REVENUE	14	62
DEFERRED INCOME TAX LIABILITIES	201,184	214,222
OTHER LONG-TERM LIABILITIES	11,025	11,236
Total liabilities	1,321,215	1,343,156
SHAREHOLDERS' EQUITY:
Total shareholders' equity	456,616	644,706
Total liabilities and shareholders' equity	1,777,831	1,987,862
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	(409)	4,107
Accounts receivable, net	5,137	5,552
Intercompany receivable	15,058	7,961
Inventories	17,358	15,897
Deferred income tax assets, current portion	2,807	1,097
Prepaid expenses and other current assets	470	483
Total current assets	40,421	35,097
PROPERTY AND EQUIPMENT, net	16,103	17,060
INVESTMENT IN SUBSIDIARIES	5,021	5,743
GOODWILL	47,877	41,763
OTHER INTANGIBLE ASSETS, net	63,474	39,523
OTHER ASSETS	260	184
Total assets	173,156	139,370
CURRENT LIABILITIES:
Accounts payable	5,945	3,315
Intercompany payable	69,999	59,347
Accrued expenses and other current liabilities	4,950	5,290
Income taxes payable	(29,698)	(30,457)
Deferred revenue, current portion	12	6
Current portion of long-term debt, net of debt discounts	11	39
Total current liabilities	51,219	37,540
LONG-TERM DEBT, net of debt discounts	15	28
DEFERRED INCOME TAX LIABILITIES	10,157	4,861
OTHER LONG-TERM LIABILITIES	11,425	114
Total liabilities	72,816	42,543
SHAREHOLDERS' EQUITY:
Total shareholders' equity	100,340	96,827
Total liabilities and shareholders' equity	173,156	139,370
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	19,167	18,310
Accounts receivable, net	34,934	36,017
Intercompany receivable	6,548	4,313
Inventories	13,184	12,978
Deferred income tax assets, current portion	464	533
Prepaid expenses and other current assets	5,884	4,734
Total current assets	80,181	76,885
PROPERTY AND EQUIPMENT, net	22,245	19,197
INVESTMENT IN SUBSIDIARIES	3,114	4
GOODWILL	60,174	57,898
OTHER INTANGIBLE ASSETS, net	43,153	40,886
OTHER ASSETS	339	405
Total assets	209,206	195,275
CURRENT LIABILITIES:
Accounts payable	2,915	2,736
Intercompany payable	8,675	7,440
Accrued expenses and other current liabilities	10,085	9,711
Income taxes payable	3,840	3,451
Deferred revenue, current portion	1,532	1,160
Total current liabilities	27,047	24,498
DEFERRED REVENUE	72	99
DEFERRED INCOME TAX LIABILITIES	12,038	11,957
OTHER LONG-TERM LIABILITIES	1,383	1,222
Total liabilities	40,540	37,776
SHAREHOLDERS' EQUITY:
Total shareholders' equity	168,666	157,499
Total liabilities and shareholders' equity	$ 209,206	$ 195,275