Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016
Assets:
Goodwill	$ 1,301,391		$ 1,291,593
Liabilities:
Total consideration		$ 134,000
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)
Service contracts | ZEE
Assets:
Intangible assets		34,000
Other intangibles | ZEE
Assets:
Intangible assets		$ 4,500