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Contingencies (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Warranty Accrual Activity Table
Additions charged to costs and expenses	$ 6,914
Deductions	(5,884)
Other	$ 14

X

- Definition

Represents the aggregate net adjustments in the liability for accruals related to standard and extended product warranties acquired in a business acquisition, increase (decrease) in product warranty liability due to currency translation and any other increase (decrease) in product warranties not previously disclosed or identified, issued during the reporting period.

+ Details

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Namespace Prefix:	rop
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	rop_ProductWarrantyDisclosureAbstract
Namespace Prefix:	rop
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration