Subsequent Event (Details) (USD $)			3 Months Ended				3 Months Ended
	Aug. 31, 2014	May 31, 2014	Aug. 31, 2014 Document Imaging and Document Retention Services	Aug. 31, 2013 Document Imaging and Document Retention Services		Aug. 31, 2014 Document Imaging and Document Retention Services Discontinued Operations, Held-for-sale or Disposed of by Sale	Aug. 31, 2014 United Kingdom Document Imaging and Document Retention Services Discontinued Operations, Held-for-sale or Disposed of by Sale
Subsequent Event [Line Items]
Assets held for sale	$ 151,263,000	$ 0				$ 151,263,000	$ 43,300,000
Revenue			20,785,000	20,097,000	[1]		7,600,000
Income from discontinued operations							$ 300,000

[1] Results for the three months ended August 31, 2013 were previously included in continuing operations.