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Summary of Significant Accounting Policies - Effects of Adoption on Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2019
Aug. 31, 2018
Revenue:        
Total revenue $ 6,203,659 $ 4,822,268 $ 17,176,000 $ 14,223,898
Cost of revenue:        
Gross profit 725,990 430,117 2,103,379 1,272,790
Selling, general and administrative expenses (517,135) (316,274) (1,557,906) (923,449)
Operating income 208,855 113,843 545,473 349,341
Interest expense and finance charges, net (42,945) (20,058) (127,695) (53,884)
Other income (expense), net (1,087) (872) 19,764 (3,497)
Income before income taxes 164,823 92,913 437,542 291,960
Provision for income taxes (41,691) (25,973) (112,831) (107,181)
Net income $ 123,132 $ 66,940 $ 324,711 $ 184,779
Earnings per common share:        
Basic $ 2.41 $ 1.69 $ 6.35 $ 4.64
Diluted $ 2.40 $ 1.68 $ 6.32 $ 4.61
As Reported | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   $ 4,906,610   $ 14,431,562
Cost of revenue:        
Gross profit   433,170   1,276,215
Selling, general and administrative expenses   (316,274)   (923,449)
Operating income   116,896   352,766
Interest expense and finance charges, net   (20,058)   (53,884)
Other income (expense), net   (872)   (3,497)
Income before income taxes   95,966   295,385
Provision for income taxes   (26,675)   (107,968)
Net income   $ 69,291   $ 187,417
Earnings per common share:        
Basic   $ 1.75   $ 4.70
Diluted   $ 1.74   $ 4.67
Adjustments for ASC Topic 606 | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   $ (84,342)   $ (207,664)
Cost of revenue:        
Gross profit   (3,053)   (3,425)
Selling, general and administrative expenses   0   0
Operating income   (3,053)   (3,425)
Interest expense and finance charges, net   0   0
Other income (expense), net   0   0
Income before income taxes   (3,053)   (3,425)
Provision for income taxes   702   787
Net income   $ (2,351)   $ (2,638)
Earnings per common share:        
Basic   $ (0.06)   $ (0.06)
Diluted   $ (0.06)   $ (0.06)
Product        
Revenue:        
Total revenue $ 5,047,968 $ 4,334,755 $ 13,695,725 $ 12,746,591
Cost of revenue:        
Cost of revenue (4,746,197) (4,083,829) (12,876,410) (12,024,111)
Product | As Reported | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   4,419,097   12,954,255
Cost of revenue:        
Cost of revenue   (4,165,118)   (12,228,350)
Product | Adjustments for ASC Topic 606 | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   (84,342)   (207,664)
Cost of revenue:        
Cost of revenue   81,289   204,239
Service        
Revenue:        
Total revenue 1,155,690 487,513 3,480,275 1,477,308
Cost of revenue:        
Cost of revenue $ (731,472) (308,322) $ (2,196,212) (926,998)
Service | As Reported | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   487,513   1,477,308
Cost of revenue:        
Cost of revenue   (308,322)   (926,998)
Service | Adjustments for ASC Topic 606 | Accounting Standards Update 2014-09        
Revenue:        
Total revenue   0   0
Cost of revenue:        
Cost of revenue   $ 0   $ 0