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Contingencies (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Warranty Accrual Activity Table
Balance	$ 7,038
Additions charged to costs and expenses	4,151
Deductions	(3,657)
Other	507
Balance	$ 8,039

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
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Balance Type:	na
Period Type:	duration

X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Subparagraph 5
-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10

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Balance Type:	credit
Period Type:	instant

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
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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
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