Basis of Presentation - Schedule of Impact of Adopting New Revenue Guidance (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Jun. 01, 2018	May 31, 2018	Aug. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net	$ 838,192	$ 818,009	$ 804,583
Inventories, net	303,770	269,082	280,347
Prepaid expenses and other current assets	112,474	95,846	32,383
Total current assets	2,104,378	2,043,556	1,977,932
Other assets, net	221,983	216,818	29,315
Total assets	7,287,204	7,211,341	6,958,214	$ 6,851,606
Deferred income taxes	424,344	416,516	352,581
Total long-term liabilities	3,262,142	3,229,766	3,165,831
Retained earnings	6,239,535	6,027,019	5,837,827
Total shareholders’ equity	3,345,968	3,205,718	3,016,526
Total liabilities and shareholders' equity	$ 7,287,204	7,211,341	6,958,214
Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net			804,583
Inventories, net			280,347
Prepaid expenses and other current assets			32,383
Total current assets			1,977,932
Other assets, net			29,315
Total assets			6,958,214
Deferred income taxes			352,581
Total long-term liabilities			3,165,831
Retained earnings			5,837,827
Total shareholders’ equity			3,016,526
Total liabilities and shareholders' equity			$ 6,958,214
Restatement Adjustment | 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
Restatement Adjustment | 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