Business Segments - Additional reportable segment information (Details 1) (Reportable business segments, USD $) In Thousands, unless otherwise specified	Apr. 30, 2011
Segment Reporting Information [Line Items]
Assets	$ 87,803
Expenditures for Segment Assets	1,907
Publishing
Segment Reporting Information [Line Items]
Assets	11,827
Expenditures for Segment Assets	1,897
Investment Management
Segment Reporting Information [Line Items]
Assets
Expenditures for Segment Assets	10
Corporate assets
Segment Reporting Information [Line Items]
Assets	75,976
Expenditures for Segment Assets