Discontinued Operations - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Nov. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	May. 31, 2015 USD ($) transaction buyer
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business interest in affiliates	$ 578,257		$ 578,257	$ 0
Equity method investments	15,500		15,500		$ 225,700
Gain on disposal of business			15,786	34,137
Proceeds from Storage Transactions, net of cash contributed			35,338	153,996
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of business	10,943	$ 34,137	$ 15,786	$ 34,137
Shred-it | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimated additional consideration subject to holdback provisions (up to)	34,000
Equity method investments					$ 210,100
Amortization period of basis difference			9 years
Loss on investment in Shred-it, net of tax			$ 24,300
Amortization of basis difference			4,800
Gain on disposal of business	3,900
Storage Business | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of transactions involved in sale of business | transaction					3
Number of buyers involved in sale of business | buyer					3
Gain on disposal of business	$ 10,900
Storage Real Estate Assets | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal of business			4,800
Proceeds from Storage Transactions, net of cash contributed			$ 24,400