Guarantor and Non-Guarantor Financial Statements - Condensed Consolidating Statements of Cash Flow (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	$ 843.6us-gaap_SalesRevenueNet	$ 825.7us-gaap_SalesRevenueNet	$ 1,618.4us-gaap_SalesRevenueNet	$ 1,556.4us-gaap_SalesRevenueNet
Cash flows provided by (used in) operating activities			162.7	170.9
Proceeds from sales/maturities of investments			15.2	19.0
Purchases of investments			(16.3)us-gaap_PaymentsToAcquireInvestments	(19.6)us-gaap_PaymentsToAcquireInvestments
Capital expenditures			(132.1)	(98.5)
Payments to Acquire Businesses, Net of Cash Acquired			0.6	0.8
Net cash used in investing activities			(133.8)	(248.6)
Payments under senior secured credit facilities			(8.0)	(14.9)
Proceeds under revolvers			205.0	159.3
Payments under revolvers			(20.0)	(7.0)
Proceeds from senior notes due 2020 and term loans			0us-gaap_ProceedsFromNotesPayable	870.5us-gaap_ProceedsFromNotesPayable
Retirement of term loans			(180.0)us-gaap_RepaymentsOfNotesPayable	(1,091.6)us-gaap_RepaymentsOfNotesPayable
Payment of fees related to refinancing activities			0	15.5
Net cash provided by (used in) financing activities			(2.7)	(101.2)
Effect of exchange rate changes on cash			2.7	(0.5)
Increase (decrease) in cash and cash equivalents			28.9	(179.4)
Cash and cash equivalents, beginning of period			247.6	355.6
Cash and cash equivalents, end of period	276.5	176.2	276.5	176.2
Cost of sales	183.8us-gaap_CostOfRevenue	255.1us-gaap_CostOfRevenue	399.7us-gaap_CostOfRevenue	463.1us-gaap_CostOfRevenue
Gross Profit	659.8us-gaap_GrossProfit	570.6us-gaap_GrossProfit	1,218.7us-gaap_GrossProfit	1,093.3us-gaap_GrossProfit
Selling, general and administrative expense	367.7	340.4	729.4	653.7
Research and development expense	42.9us-gaap_ResearchAndDevelopmentExpense	41.4us-gaap_ResearchAndDevelopmentExpense	85.7us-gaap_ResearchAndDevelopmentExpense	78.9us-gaap_ResearchAndDevelopmentExpense
Amortization	79.6us-gaap_AmortizationOfIntangibleAssets	75.2us-gaap_AmortizationOfIntangibleAssets	151.5us-gaap_AmortizationOfIntangibleAssets	150.7us-gaap_AmortizationOfIntangibleAssets
Operating Income (Loss)	169.6us-gaap_OperatingIncomeLoss	113.6us-gaap_OperatingIncomeLoss	252.1us-gaap_OperatingIncomeLoss	210.0us-gaap_OperatingIncomeLoss
Interest expense	78.5us-gaap_InterestExpense	105.7us-gaap_InterestExpense	158.6us-gaap_InterestExpense	193.3us-gaap_InterestExpense
Other Nonoperating Income (Expense)	2.1us-gaap_OtherNonoperatingIncomeExpense	(3.7)us-gaap_OtherNonoperatingIncomeExpense	6.3us-gaap_OtherNonoperatingIncomeExpense	(5.9)us-gaap_OtherNonoperatingIncomeExpense
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	93.2	4.2	99.8	10.8
Net income	89.8us-gaap_NetIncomeLoss	4.9us-gaap_NetIncomeLoss	97.1us-gaap_NetIncomeLoss	36.0us-gaap_NetIncomeLoss
Other comprehensive income (loss)	(136.1)	37.1	(180.3)	55.3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(46.3)us-gaap_ComprehensiveIncomeNetOfTax	42.0us-gaap_ComprehensiveIncomeNetOfTax	(83.2)us-gaap_ComprehensiveIncomeNetOfTax	91.3us-gaap_ComprehensiveIncomeNetOfTax
Biomet, Inc [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	0	0	0	0
Cash flows provided by (used in) operating activities			3.0	96.5
Proceeds from sales/maturities of investments			0	0
Purchases of investments			0	0
Capital expenditures			0	0
Other			0	0
Net cash used in investing activities			0	0
Payments under senior secured credit facilities				(14.9)
Proceeds under revolvers			205.0	155.0
Payments under revolvers			(20.0)
Proceeds from senior notes due 2020 and term loans				870.5
Retirement of term loans			(180.0)	(1,091.6)
Payment of fees related to refinancing activities				15.5
Other			(8.0)	0
Net cash provided by (used in) financing activities			(3.0)	(96.5)
Effect of exchange rate changes on cash			0	0
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
Cost of sales	0	0	0	0
Gross Profit	0	0	0	0
Selling, general and administrative expense	0	0	0	0
Research and development expense	0	0	0	0
Amortization	0	0	0	0
Operating Income (Loss)	0	0	0	0
Interest expense	78.5	106.1	158.6	193.1
Other Nonoperating Income (Expense)	0	(4.8)	0	(4.8)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(78.5)	(110.9)	(158.6)	(197.9)
Tax expense (benefit)	(29.8)	(42.1)	(60.3)	(75.2)
Equity in earnings of subsidiaries	138.5	73.7	195.4	158.7
Net income	89.8	4.9	97.1	36.0
Other comprehensive income (loss)	(136.1)	8.8	(180.3)	22.3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(46.3)	13.7	(83.2)	58.3
Guarantor [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	532.5	510.6	1,041.3	992.0
Cash flows provided by (used in) operating activities			60.9	278.5
Proceeds from sales/maturities of investments			0	19.0
Purchases of investments			0	(19.6)
Capital expenditures			(74.3)	(53.9)
Other			(0.6)	(0.8)
Net cash used in investing activities			(74.9)	(204.1)
Payments under senior secured credit facilities				0
Proceeds under revolvers			0	0
Payments under revolvers			0
Proceeds from senior notes due 2020 and term loans				0
Retirement of term loans			0	0
Payment of fees related to refinancing activities				0
Other			0.3	0.3
Net cash provided by (used in) financing activities			0.3	0.3
Effect of exchange rate changes on cash			0	0
Increase (decrease) in cash and cash equivalents			(13.7)	74.7
Cash and cash equivalents, beginning of period			101.8	35.3
Cash and cash equivalents, end of period	88.1	110.0	88.1	110.0
Cost of sales	158.5	221.5	364.7	402.2
Gross Profit	374.0	289.1	676.6	589.8
Selling, general and administrative expense	238.5	209.6	469.7	403.5
Research and development expense	32.0	30.3	63.4	58.2
Amortization	60.6	61.8	116.1	123.1
Operating Income (Loss)	42.9	(12.6)	27.4	5.0
Interest expense	0	0	0	0
Other Nonoperating Income (Expense)	(5.9)	1.2	(11.1)	3.5
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	37.0	(11.4)	16.3	8.5
Tax expense (benefit)	14.0	(4.3)	6.1	3.3
Equity in earnings of subsidiaries	0	0	0	0
Net income	23.0	(7.1)	10.2	5.2
Other comprehensive income (loss)	0	0	0.1	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	23.0	(7.1)	10.3	5.2
Non-Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	311.1	315.1	577.1	564.4
Cash flows provided by (used in) operating activities			98.8	(204.1)
Proceeds from sales/maturities of investments			15.2	0
Purchases of investments			(16.3)	0
Capital expenditures			(57.8)	(44.6)
Other			0	0.1
Net cash used in investing activities			(58.9)	(44.5)
Payments under senior secured credit facilities				0
Proceeds under revolvers			0	4.3
Payments under revolvers			0
Proceeds from senior notes due 2020 and term loans				0
Retirement of term loans			0	0
Payment of fees related to refinancing activities				0
Other			0	(9.3)
Net cash provided by (used in) financing activities			0	(5.0)
Effect of exchange rate changes on cash			2.7	(0.5)
Increase (decrease) in cash and cash equivalents			42.6	(254.1)
Cash and cash equivalents, beginning of period			145.8	320.3
Cash and cash equivalents, end of period	188.4	66.2	188.4	66.2
Cost of sales	25.3	33.6	35.0	60.9
Gross Profit	285.8	281.5	542.1	503.5
Selling, general and administrative expense	129.2	130.8	259.7	250.2
Research and development expense	10.9	11.1	22.3	20.7
Amortization	19.0	13.4	35.4	27.6
Operating Income (Loss)	126.7	126.2	224.7	205.0
Interest expense	0	(0.4)	0	0.2
Other Nonoperating Income (Expense)	8.0	(0.1)	17.4	(4.6)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	134.7	126.5	242.1	200.2
Tax expense (benefit)	19.2	45.7	56.9	46.7
Equity in earnings of subsidiaries	0	0	0	0
Net income	115.5	80.8	185.2	153.5
Other comprehensive income (loss)	(135.7)	28.3	(183.6)	33.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(20.2)	109.1	1.6	186.5
Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	0	0	0	0
Cash flows provided by (used in) operating activities			0	0
Proceeds from sales/maturities of investments			0
Purchases of investments			0
Capital expenditures			0	0
Other			0	0
Net cash used in investing activities			0	0
Payments under senior secured credit facilities				0
Proceeds under revolvers			0	0
Payments under revolvers			0
Proceeds from senior notes due 2020 and term loans				0
Retirement of term loans			0	0
Payment of fees related to refinancing activities				0
Other			0	0
Net cash provided by (used in) financing activities			0	0
Effect of exchange rate changes on cash			0	0
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
Cost of sales	0	0	0	0
Gross Profit	0	0	0	0
Selling, general and administrative expense	0	0	0	0
Research and development expense	0	0	0	0
Amortization	0	0	0	0
Operating Income (Loss)	0	0	0	0
Interest expense	0	0	0	0
Other Nonoperating Income (Expense)	0	0	0	0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	0	0	0	0
Tax expense (benefit)	0	0	0	0
Equity in earnings of subsidiaries	(138.5)	(73.7)	(195.4)	(158.7)
Net income	(138.5)	(73.7)	(195.4)	(158.7)
Other comprehensive income (loss)	135.7	0	183.5	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(2.8)	(73.7)	(11.9)	(158.7)
Biomet, Inc. [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net sales	843.6	825.7	1,618.4	1,556.4
Cash flows provided by (used in) operating activities			162.7	170.9
Proceeds from sales/maturities of investments			15.2	19.0
Purchases of investments			(16.3)	(19.6)
Capital expenditures			(132.1)	(98.5)
Payments to Acquire Businesses, Net of Cash Acquired			0.6	0.8
Other			(0.6)	(0.7)
Net cash used in investing activities			(133.8)	(248.6)
Payments under senior secured credit facilities			(8.0)	(14.9)
Proceeds under revolvers			205.0	159.3
Payments under revolvers			(20.0)	(7.0)
Proceeds from senior notes due 2020 and term loans			0	870.5
Retirement of term loans			(180.0)	(1,091.6)
Payment of fees related to refinancing activities			0	15.5
Other			(7.7)	(9.0)
Net cash provided by (used in) financing activities			(2.7)	(101.2)
Effect of exchange rate changes on cash			2.7	(0.5)
Increase (decrease) in cash and cash equivalents			28.9	(179.4)
Cash and cash equivalents, beginning of period			247.6	355.6
Cash and cash equivalents, end of period	276.5	176.2	276.5	176.2
Cost of sales	183.8	255.1	399.7	463.1
Gross Profit	659.8	570.6	1,218.7	1,093.3
Selling, general and administrative expense	367.7	340.4	729.4	653.7
Research and development expense	42.9	41.4	85.7	78.9
Amortization	79.6	75.2	151.5	150.7
Operating Income (Loss)	169.6	113.6	252.1	210.0
Interest expense	78.5	105.7	158.6	193.3
Other Nonoperating Income (Expense)	2.1	(3.7)	6.3	(5.9)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	93.2	4.2	99.8	10.8
Tax expense (benefit)	3.4	(0.7)	2.7	(25.2)
Equity in earnings of subsidiaries	0	0	0	0
Net income	89.8	4.9	97.1	36.0
Other comprehensive income (loss)	(136.1)	37.1	(180.3)	55.3
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(46.3)	42.0	(83.2)	91.3
Lanx, Inc. [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			0	148.8
Lanx, Inc. [Member] \| Biomet, Inc [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				0
Lanx, Inc. [Member] \| Guarantor [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				148.8
Lanx, Inc. [Member] \| Non-Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				0
Lanx, Inc. [Member] \| Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				0
Lanx, Inc. [Member] \| Biomet, Inc. [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 0	$ 148.8

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Equity In Earnings In Subsidiaries

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Income Tax Expense Benefit Net

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Amount of the cost of borrowed funds accounted for as interest expense.

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