Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
NET SALES	$ 95,605us-gaap_SalesRevenueNet	$ 90,979us-gaap_SalesRevenueNet	$ 294,323us-gaap_SalesRevenueNet	$ 287,226us-gaap_SalesRevenueNet
COST OF SALES (exclusive of amortization shown separately below)	33,971	32,359	106,571	103,092
GROSS MARGIN	61,634us-gaap_GrossProfit	58,620us-gaap_GrossProfit	187,752us-gaap_GrossProfit	184,134us-gaap_GrossProfit
OPERATING EXPENSES
Research and development	7,280us-gaap_ResearchAndDevelopmentExpense	6,738us-gaap_ResearchAndDevelopmentExpense	21,474us-gaap_ResearchAndDevelopmentExpense	22,178us-gaap_ResearchAndDevelopmentExpense
Selling and marketing	13,513us-gaap_SellingAndMarketingExpense	14,295us-gaap_SellingAndMarketingExpense	43,942us-gaap_SellingAndMarketingExpense	43,757us-gaap_SellingAndMarketingExpense
Distribution	4,986	5,068	15,342	14,624
General and administrative	9,362us-gaap_GeneralAndAdministrativeExpense	10,310us-gaap_GeneralAndAdministrativeExpense	30,943us-gaap_GeneralAndAdministrativeExpense	29,534us-gaap_GeneralAndAdministrativeExpense
Amortization expense	13,615us-gaap_AdjustmentForAmortization	13,225us-gaap_AdjustmentForAmortization	40,948us-gaap_AdjustmentForAmortization	39,647us-gaap_AdjustmentForAmortization
Acquisition-related items				(4,638)us-gaap_OtherOperatingIncome
Impairment loss		150us-gaap_AssetImpairmentCharges		180us-gaap_AssetImpairmentCharges
Total operating expenses	48,756us-gaap_OperatingExpenses	49,786us-gaap_OperatingExpenses	152,649us-gaap_OperatingExpenses	145,282us-gaap_OperatingExpenses
INCOME FROM OPERATIONS	12,878us-gaap_OperatingIncomeLoss	8,834us-gaap_OperatingIncomeLoss	35,103us-gaap_OperatingIncomeLoss	38,852us-gaap_OperatingIncomeLoss
NON-OPERATING (EXPENSE) INCOME
Interest income	42us-gaap_InvestmentIncomeInterest	16us-gaap_InvestmentIncomeInterest	131us-gaap_InvestmentIncomeInterest	28us-gaap_InvestmentIncomeInterest
Interest expense	(21,793)us-gaap_InterestExpense	(21,900)us-gaap_InterestExpense	(66,913)us-gaap_InterestExpense	(66,172)us-gaap_InterestExpense
Other, net	177us-gaap_OtherNonoperatingIncomeExpense	(108)us-gaap_OtherNonoperatingIncomeExpense	465us-gaap_OtherNonoperatingIncomeExpense	(301)us-gaap_OtherNonoperatingIncomeExpense
Total non-operating net expense	(21,574)us-gaap_NonoperatingIncomeExpense	(21,992)us-gaap_NonoperatingIncomeExpense	(66,317)us-gaap_NonoperatingIncomeExpense	(66,445)us-gaap_NonoperatingIncomeExpense
LOSS BEFORE INCOME TAXES	(8,696)	(13,158)	(31,214)	(27,593)
EXPENSE (BENEFIT) FOR INCOME TAXES	30,744us-gaap_IncomeTaxExpenseBenefit	(5,803)us-gaap_IncomeTaxExpenseBenefit	22,783us-gaap_IncomeTaxExpenseBenefit	(11,691)us-gaap_IncomeTaxExpenseBenefit
NET LOSS	$ (39,440)us-gaap_ProfitLoss	$ (7,355)us-gaap_ProfitLoss	$ (53,997)us-gaap_ProfitLoss	$ (15,902)us-gaap_ProfitLoss

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