Basis of Presentation - Schedule of Impact of Adopting New Revenue Guidance Balance Sheet (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
ASSETS
Accounts receivable, net	$ 878,037			$ 818,009	$ 804,583
Inventories, net	339,805			269,082	280,347
Income taxes, current	42,552				19,634
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
Long-term liabilities:
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
Under Historical Guidance
ASSETS
Accounts receivable, net	861,725
Inventories, net	352,714
Income taxes, current	42,855
Prepaid expenses and other current assets	40,616
Total current assets	2,152,303
Other assets, net	37,756
Total assets	7,162,125
Long-term liabilities:
Deferred income taxes	370,811
Total long-term liabilities	3,191,630
Retained earnings	6,261,773
Total shareholders’ equity	2,976,144
Total liabilities and shareholders' equity	7,162,125
Accounting Standards Update 2014-09 | Impact of Adopting ASU 2014-09
ASSETS
Accounts receivable, net	16,312
Inventories, net	(12,909)
Income taxes, current	(303)
Prepaid expenses and other current assets	68,353
Total current assets	71,453
Other assets, net	200,095
Total assets	271,548
Long-term liabilities:
Deferred income taxes	68,200
Total long-term liabilities	68,200
Retained earnings	203,348
Total shareholders’ equity	203,348
Total liabilities and shareholders' equity	$ 271,548