Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Feb. 29, 2016	Aug. 01, 2015	May. 31, 2015
Assets:
Goodwill	$ 1,284,434		$ 1,195,612
ZEE Medical, Inc.
Assets:
Cash and cash equivalents		$ 333
Accounts receivable		16,705
Inventory		5,987
Other current assets		1,443
Property, plant and equipment		1,331
Goodwill		81,303
Liabilities:
Accounts payable		(7,195)
Accrued liabilities		(4,407)
Total consideration		134,000
Service contracts | ZEE Medical, Inc.
Assets:
Intangible assets		34,000
Other intangibles | ZEE Medical, Inc.
Assets:
Intangible assets		$ 4,500