Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Aug. 31, 2016	May 31, 2016
Assets:
Goodwill	$ 1,303,038		$ 1,291,593
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
Service contracts | ZEE
Assets:
Intangible assets		34,000
Other intangibles | ZEE
Assets:
Intangible assets		$ 4,500