XML 31 R81.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Summary Selected Quarterly Financial Data (unaudited) (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
Summary Selected Quarterly Financial Data (Textual) [Abstract] |  |  |  |
Deferred income tax benefit |  | $ 5.5 |  |
Change in accounting estimates reversal of expense |  |  | 1.1 | 0.8
Investment losses related to prior year periods before tax | (0.2) | (0.6) |  |
Investment losses related to prior year periods after tax | $ (0.1) | $ (0.4) |  |

X
- Definition Change in accounting estimates reversal of expense. + References No definition available. + Details
Name: | forr_ChangeInAccountingEstimatesReversalOfExpense
Namespace Prefix: | forr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (Losses) from non-marketable investments before tax. + References No definition available. + Details
Name: | forr_GainLossesFromNonMarketableInvestmentsBeforeTax
Namespace Prefix: | forr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (losses) from non-marketable investments net. + References No definition available. + Details
Name: | forr_GainLossesFromNonMarketableInvestmentsNet
Namespace Prefix: | forr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recognized deferred income taxes. + References No definition available. + Details
Name: | forr_RecognizedDeferredIncomeTaxes
Namespace Prefix: | forr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | forr_SummarySelectedQuarterlyFinancialDataTextualAbstract
Namespace Prefix: | forr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration