Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 31, 2015	Aug. 01, 2015	May. 31, 2015
Assets:
Goodwill	$ 1,272,503		$ 1,195,612
ZEE Medical, Inc.
Assets:
Cash and cash equivalents		$ 431
Accounts receivable		17,310
Inventory		6,195
Other current assets		1,477
Property, plant and equipment		1,354
Goodwill		77,630
Liabilities:
Accounts payable		(7,342)
Accrued liabilities		(2,525)
Total Consideration		134,000
Service contracts | ZEE Medical, Inc.
Assets:
Intangible Assets		34,970
Other intangibles | ZEE Medical, Inc.
Assets:
Intangible Assets		$ 4,500