Note 17 - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Nov. 30, 2015	May. 31, 2015
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	$ 6,596	$ 7,080
Trade accounts receivable, net of allowance for doubtful accounts of $1,866 and $1,669 at November 30, 2015 and May 31, 2015, respectively	30,767	30,442
Intercompany receivable	76,192	68,815
Inventories, net	19,872	18,361
Deferred income tax assets, current portion	2,511	2,512
Prepaid expenses and other current assets	4,482	5,178
Total current assets	140,420	132,388
PROPERTY AND EQUIPMENT, net	39,382	38,915
INVESTMENT IN SUBSIDIARIES	212,808	220,412
GOODWILL	744,149	744,149
INTANGIBLE ASSETS, net	533,162	557,133
DEFERRED FINANCING COSTS, net	22,864	26,399
OTHER ASSETS	14,837	14,533
Total assets	1,707,622	1,733,929
CURRENT LIABILITIES:
Accounts payable	7,378	6,297
Intercompany payable	8,297	2,389
Accrued interest and interest rate swap liability	19,097	19,288
Accrued expenses and other current liabilities	7,662	13,758
Income taxes payable	30,055	30,061
Deferred revenue, current portion	1,796	1,498
Current portion of long-term debt, net of debt discounts	4,403	4,462
Total current liabilities	78,688	77,753
LONG-TERM DEBT, net of debt discounts	1,031,406	1,033,276
DEFERRED INCOME TAX LIABILITIES	218,802	223,232
OTHER LONG-TERM LIABILITIES	16,615	15,987
Total liabilities	1,345,511	1,350,248
SHAREHOLDERS' EQUITY:
Total shareholders' equity	362,111	383,681
Total liabilities and shareholders' equity	1,707,622	1,733,929
Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	(365)	(263)
Trade accounts receivable, net of allowance for doubtful accounts of $1,866 and $1,669 at November 30, 2015 and May 31, 2015, respectively	5,483	6,014
Intercompany receivable	21,372	24,201
Inventories, net	14,998	13,706
Deferred income tax assets, current portion	2,254	2,253
Prepaid expenses and other current assets	376	426
Total current assets	44,118	46,337
PROPERTY AND EQUIPMENT, net	12,971	13,849
INVESTMENT IN SUBSIDIARIES	5,020	5,021
GOODWILL	47,985	47,640
INTANGIBLE ASSETS, net	$ 57,163	$ 59,164
DEFERRED FINANCING COSTS, net
OTHER ASSETS	$ 194	$ 310
Total assets	167,451	172,321
CURRENT LIABILITIES:
Accounts payable	3,386	2,604
Intercompany payable	$ 93,823	$ 91,547
Accrued interest and interest rate swap liability
Accrued expenses and other current liabilities	$ 4,697	$ 5,131
Income taxes payable	$ (30,092)	(30,074)
Deferred revenue, current portion		7
Current portion of long-term debt, net of debt discounts	$ 1	7
Total current liabilities	$ 71,815	$ 69,222
LONG-TERM DEBT, net of debt discounts
DEFERRED INCOME TAX LIABILITIES	$ 851	$ 3,639
OTHER LONG-TERM LIABILITIES	12,461	11,908
Total liabilities	85,127	84,769
SHAREHOLDERS' EQUITY:
Total shareholders' equity	82,324	87,552
Total liabilities and shareholders' equity	167,451	172,321
Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	8,836	11,546
Trade accounts receivable, net of allowance for doubtful accounts of $1,866 and $1,669 at November 30, 2015 and May 31, 2015, respectively	28,988	31,218
Intercompany receivable	13,325	8,861
Inventories, net	11,440	11,830
Deferred income tax assets, current portion	414	375
Prepaid expenses and other current assets	4,949	5,557
Total current assets	67,952	69,387
PROPERTY AND EQUIPMENT, net	19,873	20,810
INVESTMENT IN SUBSIDIARIES	3,018	3,019
GOODWILL	48,373	50,469
INTANGIBLE ASSETS, net	$ 31,670	$ 33,997
DEFERRED FINANCING COSTS, net
OTHER ASSETS	$ 381	$ 342
Total assets	171,267	178,024
CURRENT LIABILITIES:
Accounts payable	2,920	4,965
Intercompany payable	$ 8,769	$ 7,941
Accrued interest and interest rate swap liability
Accrued expenses and other current liabilities	$ 5,412	$ 7,319
Income taxes payable	3,081	3,509
Deferred revenue, current portion	$ 1,048	$ 1,198
Current portion of long-term debt, net of debt discounts
Total current liabilities	$ 21,230	$ 24,932
LONG-TERM DEBT, net of debt discounts
DEFERRED INCOME TAX LIABILITIES	$ 9,249	$ 9,616
OTHER LONG-TERM LIABILITIES	1,268	1,317
Total liabilities	31,747	35,865
SHAREHOLDERS' EQUITY:
Total shareholders' equity	139,520	142,159
Total liabilities and shareholders' equity	$ 171,267	$ 178,024
Consolidation, Eliminations [Member]
CURRENT ASSETS:
Cash and cash equivalents
Trade accounts receivable, net of allowance for doubtful accounts of $1,866 and $1,669 at November 30, 2015 and May 31, 2015, respectively
Intercompany receivable	$ (110,889)	$ (101,877)
Inventories, net	(1,626)	(2,050)
Deferred income tax assets, current portion	$ 628	$ 791
Prepaid expenses and other current assets
Total current assets	$ (111,887)	$ (103,136)
PROPERTY AND EQUIPMENT, net
INVESTMENT IN SUBSIDIARIES	$ (220,846)	$ (228,452)
GOODWILL
INTANGIBLE ASSETS, net
DEFERRED FINANCING COSTS, net
OTHER ASSETS
Total assets	$ (332,733)	$ (331,588)
CURRENT LIABILITIES:
Accounts payable
Intercompany payable	$ (110,889)	$ (101,877)
Accrued interest and interest rate swap liability
Accrued expenses and other current liabilities
Income taxes payable
Deferred revenue, current portion
Current portion of long-term debt, net of debt discounts
Total current liabilities	$ (110,889)	$ (101,877)
LONG-TERM DEBT, net of debt discounts
DEFERRED INCOME TAX LIABILITIES
OTHER LONG-TERM LIABILITIES
Total liabilities	$ (110,889)	$ (101,877)
SHAREHOLDERS' EQUITY:
Total shareholders' equity	(221,844)	(229,711)
Total liabilities and shareholders' equity	(332,733)	(331,588)
Cash and cash equivalents	15,067	18,363
Trade accounts receivable, net of allowance for doubtful accounts of $1,866 and $1,669 at November 30, 2015 and May 31, 2015, respectively	$ 65,238	$ 67,674
Intercompany receivable
Inventories, net	$ 44,684	$ 41,847
Deferred income tax assets, current portion	5,807	5,931
Prepaid expenses and other current assets	9,807	11,161
Total current assets	140,603	144,976
PROPERTY AND EQUIPMENT, net	$ 72,226	$ 73,574
INVESTMENT IN SUBSIDIARIES
GOODWILL	$ 840,507	$ 842,258
INTANGIBLE ASSETS, net	621,995	650,294
DEFERRED FINANCING COSTS, net	22,864	26,399
OTHER ASSETS	15,412	15,185
Total assets	1,713,607	1,752,686
Accounts payable	$ 13,684	$ 13,866
Intercompany payable
Accrued interest and interest rate swap liability	$ 19,097	$ 19,288
Accrued expenses and other current liabilities	17,771	26,208
Income taxes payable	3,044	3,496
Deferred revenue, current portion	2,844	2,703
Current portion of long-term debt, net of debt discounts	4,404	4,469
Total current liabilities	60,844	70,030
LONG-TERM DEBT, net of debt discounts	1,031,406	1,033,276
DEFERRED INCOME TAX LIABILITIES	228,902	236,487
OTHER LONG-TERM LIABILITIES	30,344	29,212
Total liabilities	1,351,496	1,369,005
Total shareholders' equity	362,111	383,681
Total liabilities and shareholders' equity	$ 1,713,607	$ 1,752,686