Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013		May 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income from discontinued operations	$ 317	$ 356
Total assets held for sale	151,263			0
Total liabilities held for sale	15,171			0
Document Imaging and Document Retention Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	20,785	20,097	[1]
Income from discontinued operations	576	458	[1]
Income tax expense on discontinued operations	259	102	[1]
Net income from discontinued operations	317	356	[1]
Discontinued Operations, Held-for-sale or Disposed of by Sale | Document Imaging and Document Retention Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	10,818
Prepaid expenses and other current assets	4,449
Property and equipment, at cost, net	48,480
Goodwill	77,200
Service contracts, net	9,897
Other assets, net	419
Total assets held for sale	151,263
Accounts payable	6,652
Accrued compensation and related liabilities	430
Accrued liabilities	1,250
Non-current deferred income taxes	6,697
Other liabilities, net	142
Total liabilities held for sale	$ 15,171

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