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Debt (Details Textuals) (Senior Notes [Member], USD $) In Millions	Jun. 30, 2011
Senior Notes [Member]
Debt (Textuals)
Estimated fair value of Senior Notes	$ 1,039.4

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Debt.

+ Details

Name:	zmh_DebtTextualsAbstract
Namespace Prefix:	zmh
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration