Acquisitions and Divestitures - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	May 31, 2017	May 31, 2016	Aug. 01, 2015	May 31, 2015
Assets:
Goodwill	$ 2,782,335	$ 1,276,076		$ 1,180,094
ZEE
Assets:
Cash and cash equivalents			$ 333
Accounts receivable			16,705
Inventory			5,987
Other current assets			1,443
Property, plant and equipment			849
Goodwill			87,442
Liabilities:
Accounts payable			(7,195)
Accrued liabilities			(4,428)
Deferred income taxes			(5,636)
Total consideration			134,000
ZEE | Service contracts
Assets:
Intangible assets			34,000
ZEE | Other intangibles
Assets:
Intangible assets			$ 4,500