Note 17 - Condensed Consolidating Financial Information of Guarantor Subsidiaries (Details) - Condensed Consolidating Balance Sheets - USD ($) $ in Thousands	Aug. 31, 2015	May. 31, 2015	Aug. 31, 2014	May. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 19,027	$ 18,363	$ 17,355	$ 23,621
Accounts receivable, net	65,683	67,674
Inventories	48,453	41,847
Deferred income tax assets, current portion	5,977	5,931
Prepaid expenses and other current assets	10,155	11,161
Total current assets	149,295	144,976
PROPERTY AND EQUIPMENT, net	73,340	73,574
GOODWILL	842,310	842,258		851,563
OTHER INTANGIBLE ASSETS, net	636,946	650,294
DEFERRED FINANCING COSTS, net	24,645	26,399
OTHER ASSETS	15,522	15,185
Total assets	1,742,058	1,752,686
CURRENT LIABILITIES:
Accounts payable	15,977	13,866
Accrued interest and interest rate swap liability	8,177	19,288
Accrued expenses and other current liabilities	19,086	26,208
Income taxes payable	3,252	3,496
Deferred revenue, current portion	2,956	2,703
Current portion of long-term debt, net of debt discounts	20,437	4,469
Total current liabilities	69,885	70,030
LONG-TERM DEBT, net of debt discounts	1,032,334	1,033,276
DEFERRED INCOME TAX LIABILITIES	232,680	236,487
OTHER LONG-TERM LIABILITIES	29,722	29,212
Total liabilities	1,364,621	1,369,005
SHAREHOLDERS' EQUITY:
Total shareholders' equity	377,437	383,681
Total liabilities and shareholders' equity	1,742,058	1,752,686
Consolidation, Eliminations [Member]
CURRENT ASSETS:
Intercompany receivable	(101,664)	(101,877)
Inventories	(1,893)	(2,050)
Deferred income tax assets, current portion	731	791
Total current assets	(102,826)	(103,136)
INVESTMENT IN SUBSIDIARIES	(227,993)	(228,452)
Total assets	(330,819)	(331,588)
CURRENT LIABILITIES:
Intercompany payable	(101,664)	(101,877)
Total current liabilities	(101,664)	(101,877)
Total liabilities	(101,664)	(101,877)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(229,155)	(229,711)
Total liabilities and shareholders' equity	(330,819)	(331,588)
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	6,503	7,080	3,312	4,898
Accounts receivable, net	28,704	30,442
Intercompany receivable	74,871	68,815
Inventories	21,748	18,361
Deferred income tax assets, current portion	2,511	2,512
Prepaid expenses and other current assets	4,763	5,178
Total current assets	139,100	132,388
PROPERTY AND EQUIPMENT, net	39,309	38,915
INVESTMENT IN SUBSIDIARIES	219,954	220,412
GOODWILL	744,149	744,149
OTHER INTANGIBLE ASSETS, net	545,147	557,133
DEFERRED FINANCING COSTS, net	24,645	26,399
OTHER ASSETS	14,711	14,533
Total assets	1,727,015	1,733,929
CURRENT LIABILITIES:
Accounts payable	9,214	6,297
Intercompany payable	2,423	2,389
Accrued interest and interest rate swap liability	8,177	19,288
Accrued expenses and other current liabilities	8,108	13,758
Income taxes payable	30,031	30,061
Deferred revenue, current portion	1,691	1,498
Current portion of long-term debt, net of debt discounts	20,433	4,462
Total current liabilities	80,077	77,753
LONG-TERM DEBT, net of debt discounts	1,032,334	1,033,276
DEFERRED INCOME TAX LIABILITIES	220,801	223,232
OTHER LONG-TERM LIABILITIES	16,367	15,987
Total liabilities	1,349,579	1,350,248
SHAREHOLDERS' EQUITY:
Total shareholders' equity	377,436	383,681
Total liabilities and shareholders' equity	1,727,015	1,733,929
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	(449)	(263)	(695)	(445)
Accounts receivable, net	5,888	6,014
Intercompany receivable	18,891	24,201
Inventories	15,132	13,706
Deferred income tax assets, current portion	2,254	2,253
Prepaid expenses and other current assets	470	426
Total current assets	42,186	46,337
PROPERTY AND EQUIPMENT, net	13,428	13,849
INVESTMENT IN SUBSIDIARIES	5,020	5,021
GOODWILL	47,985	47,640
OTHER INTANGIBLE ASSETS, net	58,250	59,164
OTHER ASSETS	436	310
Total assets	167,305	172,321
CURRENT LIABILITIES:
Accounts payable	2,794	2,604
Intercompany payable	90,626	91,547
Accrued expenses and other current liabilities	4,556	5,131
Income taxes payable	(30,090)	(30,074)
Deferred revenue, current portion	4	7
Current portion of long-term debt, net of debt discounts	4	7
Total current liabilities	67,894	69,222
DEFERRED INCOME TAX LIABILITIES	2,238	3,639
OTHER LONG-TERM LIABILITIES	12,035	11,908
Total liabilities	82,167	84,769
SHAREHOLDERS' EQUITY:
Total shareholders' equity	85,138	87,552
Total liabilities and shareholders' equity	167,305	172,321
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	12,973	11,546	$ 14,738	$ 19,168
Accounts receivable, net	31,091	31,218
Intercompany receivable	7,902	8,861
Inventories	13,466	11,830
Deferred income tax assets, current portion	481	375
Prepaid expenses and other current assets	4,922	5,557
Total current assets	70,835	69,387
PROPERTY AND EQUIPMENT, net	20,603	20,810
INVESTMENT IN SUBSIDIARIES	3,019	3,019
GOODWILL	50,176	50,469
OTHER INTANGIBLE ASSETS, net	33,549	33,997
OTHER ASSETS	375	342
Total assets	178,557	178,024
CURRENT LIABILITIES:
Accounts payable	3,969	4,965
Intercompany payable	8,615	7,941
Accrued expenses and other current liabilities	6,422	7,319
Income taxes payable	3,311	3,509
Deferred revenue, current portion	1,261	1,198
Total current liabilities	23,578	24,932
DEFERRED INCOME TAX LIABILITIES	9,641	9,616
OTHER LONG-TERM LIABILITIES	1,320	1,317
Total liabilities	34,539	35,865
SHAREHOLDERS' EQUITY:
Total shareholders' equity	144,018	142,159
Total liabilities and shareholders' equity	$ 178,557	$ 178,024