Note 16 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	May 31, 2013	Feb. 28, 2013	May 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 26,028	$ 29,388	$ 19,520	$ 18,578
Accounts receivable, net	66,686	68,086
Inventories	51,108	45,941
Deferred income tax assets, current portion	6,880	5,290
Prepaid expenses and other current assets	11,651	11,577
Total current assets	162,353	160,282
PROPERTY AND EQUIPMENT, net	75,962	76,381
GOODWILL	1,005,778	1,003,463		966,338
INTANGIBLE ASSETS, net	679,673	714,603
DEFERRED FINANCING COSTS	34,736	39,449
OTHER ASSETS	6,920	6,792
Total assets	1,965,422	2,000,970
CURRENT LIABILITIES:
Accounts payable	17,209	13,638
Accrued interest and interest rate swap liability	8,359	20,084
Accrued expenses and other current liabilities	22,573	46,738
Income taxes payable	5,880	3,873
Deferred revenue, current portion	2,641	2,252
Current portion of long	4,624	6,712
Total current liabilities	61,286	73,213
LONG-TERM DEBT	1,038,185	1,039,278
DEFERRED REVENUE	120	161
DEFERRED INCOME TAX LIABILITIES	218,157	231,040
OTHER LONG-TERM LIABILITIES	12,418	12,572
Total liabilities	1,330,166	1,356,264
SHAREHOLDERS' EQUITY:
Total shareholders' equity	635,256	644,706
Total liabilities and shareholders' equity	1,965,422	2,000,970
Consolidation, Eliminations [Member]
CURRENT ASSETS:
Intercompany receivable	(74,423)	(66,717)
Inventories	(1,801)	(1,485)
Deferred income tax assets, current portion	695	562
Total current assets	(75,529)	(67,640)
INVESTMENT IN SUBSIDIARIES	(257,274)	(253,897)
Total assets	(332,803)	(321,537)
CURRENT LIABILITIES:
Intercompany payable	(74,423)	(67,211)
Total current liabilities	(74,423)	(67,211)
Total liabilities	(74,423)	(67,211)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(258,380)	(254,326)
Total liabilities and shareholders' equity	(332,803)	(321,537)
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	4,654	6,971	767	8,093
Accounts receivable, net	29,899	26,517
Intercompany receivable	55,103	54,443
Inventories	21,667	18,551
Deferred income tax assets, current portion	3,599	3,098
Prepaid expenses and other current assets	5,494	6,360
Total current assets	120,416	115,940
PROPERTY AND EQUIPMENT, net	38,069	40,124
INVESTMENT IN SUBSIDIARIES	248,548	248,150
GOODWILL	903,513	903,802
INTANGIBLE ASSETS, net	598,227	634,194
DEFERRED FINANCING COSTS	34,736	39,449
OTHER ASSETS	6,394	6,203
Total assets	1,949,903	1,987,862
CURRENT LIABILITIES:
Accounts payable	8,982	7,587
Intercompany payable	320	424
Accrued interest and interest rate swap liability	8,359
Accrued expenses and other current liabilities	7,959	31,737
Income taxes payable	31,162	30,879
Deferred revenue, current portion	1,215	1,086
Current portion of long	4,606	6,673
Total current liabilities	62,603	78,386
LONG-TERM DEBT	1,038,170	1,039,250
DEFERRED REVENUE	22	62
DEFERRED INCOME TAX LIABILITIES	202,925	214,222
OTHER LONG-TERM LIABILITIES	10,927	11,236
Total liabilities	1,314,647	1,343,156
SHAREHOLDERS' EQUITY:
Total shareholders' equity	635,256	644,706
Total liabilities and shareholders' equity	1,949,903	1,987,862
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	(232)	4,107	(182)	(144)
Accounts receivable, net	4,605	5,552
Intercompany receivable	11,406	7,961
Inventories	16,657	15,897
Deferred income tax assets, current portion	2,209	1,097
Prepaid expenses and other current assets	710	483
Total current assets	35,355	35,097
PROPERTY AND EQUIPMENT, net	16,577	17,060
INVESTMENT IN SUBSIDIARIES	5,021	5,743
GOODWILL	42,053	41,763
INTANGIBLE ASSETS, net	37,480	39,523
OTHER ASSETS	187	184
Total assets	136,673	139,370
CURRENT LIABILITIES:
Accounts payable	5,154	3,315
Intercompany payable	64,030	59,347
Accrued expenses and other current liabilities	4,653	5,290
Income taxes payable	(30,612)	(30,457)
Deferred revenue, current portion	15	6
Current portion of long	18	39
Total current liabilities	43,258	37,540
LONG-TERM DEBT	15	28
DEFERRED INCOME TAX LIABILITIES	3,064	4,861
OTHER LONG-TERM LIABILITIES	128	114
Total liabilities	46,465	42,543
SHAREHOLDERS' EQUITY:
Total shareholders' equity	90,208	96,827
Total liabilities and shareholders' equity	136,673	139,370
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	21,606	18,310	18,935	10,629
Accounts receivable, net	32,182	36,017
Intercompany receivable	7,914	4,313
Inventories	14,585	12,978
Deferred income tax assets, current portion	377	533
Prepaid expenses and other current assets	5,447	4,734
Total current assets	82,111	76,885
PROPERTY AND EQUIPMENT, net	21,316	19,197
INVESTMENT IN SUBSIDIARIES	3,705	4
GOODWILL	60,212	57,898
INTANGIBLE ASSETS, net	43,966	40,886
OTHER ASSETS	339	405
Total assets	211,649	195,275
CURRENT LIABILITIES:
Accounts payable	3,073	2,736
Intercompany payable	10,073	7,440
Accrued expenses and other current liabilities	9,961	9,711
Income taxes payable	5,330	3,451
Deferred revenue, current portion	1,411	1,160
Total current liabilities	29,848	24,498
DEFERRED REVENUE	98	99
DEFERRED INCOME TAX LIABILITIES	12,168	11,957
OTHER LONG-TERM LIABILITIES	1,363	1,222
Total liabilities	43,477	37,776
SHAREHOLDERS' EQUITY:
Total shareholders' equity	168,172	157,499
Total liabilities and shareholders' equity	$ 211,649	$ 195,275