Discontinued Operations - Schedule of Discontinued Operations, Income Statement (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013		Nov. 30, 2014	Nov. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax (benefit) expense	$ 11,892	$ 354		$ 12,151	$ 456
Gain on sale of business				34,137	0
Net income from discontinued operations	16,966	406		17,283	762
Document Imaging and Document Retention Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	10,594	19,822	[1]	31,379	39,919	[1]
(Loss) income before income taxes	(5,279)	760	[1]	(4,703)	1,218	[1]
Income tax (benefit) expense	(2,053)	354	[1]	(1,794)	456	[1]
Gain on sale of business	34,137	0	[1]	34,137	0	[1]
Income tax expense on gain	13,945	0	[1]	13,945	0	[1]
Net income from discontinued operations	$ 16,966	$ 406	[1]	$ 17,283	$ 762	[1]

[1] Results for the three and six months ended November 30, 2013 were previously included in continuing operations.