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Available for Sale Securities and Other Investments (Tables)
 9 Months Ended
Aug. 31, 2019
Investments [Abstract]  
Schedule of Available for Sale Securities

The amortized cost, gross unrealized gains and losses and estimated fair value of investments classified as available for sale are as follows (in thousands):
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
November 30, 2018
 

 
 

 
 

 
 

Bonds and notes:
 

 
 

 
 

 
 

U.S. government securities
$
1,073,038

 
$
1

 
$
183

 
$
1,072,856

Residential mortgage-backed securities
211,209

 
376

 
1,067

 
210,518

Commercial mortgage-backed securities
16,068

 
—

 
426

 
15,642

Other asset-backed securities
111,447

 
1

 
578

 
110,870

Total Available for sale securities
$
1,411,762

 
$
378

 
$
2,254

 
$
1,409,886