Basis of Presentation - Schedule of Impact of Adopting New Revenue Guidance (Details) - USD ($) $ in Thousands	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	Jun. 01, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 878,037			$ 818,009	$ 804,583
Inventories, net	339,805			269,082	280,347
Prepaid expenses and other current assets	108,969			95,846	32,383
Total current assets	2,223,756			2,043,556	1,977,932
Other assets, net	237,851			216,818	29,315
Total assets	7,433,673			7,211,341	6,958,214	$ 6,928,593
Deferred income taxes	439,011			416,516	352,581
Total long-term liabilities	3,259,830			3,229,766	3,165,831
Retained earnings	6,465,121			6,027,019	5,837,827
Total shareholders’ equity	3,179,492	$ 3,027,244	$ 3,345,968	3,205,718	3,016,526	$ 2,893,997	$ 2,553,033	$ 2,565,881	$ 2,302,793
Total liabilities and shareholders' equity	$ 7,433,673			7,211,341	$ 6,958,214
Capitalization of Contract Costs | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net				0
Inventories, net				0
Prepaid expenses and other current assets				63,463
Total current assets				63,463
Other assets, net				187,503
Total assets				250,966
Deferred income taxes				63,389
Total long-term liabilities				63,389
Retained earnings				187,577
Total shareholders’ equity				187,577
Total liabilities and shareholders' equity				250,966
Assets With No Alternative Use | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net				13,426
Inventories, net				(11,265)
Prepaid expenses and other current assets				0
Total current assets				2,161
Other assets, net				0
Total assets				2,161
Deferred income taxes				546
Total long-term liabilities				546
Retained earnings				1,615
Total shareholders’ equity				1,615
Total liabilities and shareholders' equity				$ 2,161