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Income Taxes - Differences Between Consolidated Effective Income Tax Rate and Federal Statutory Rate (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Jul. 31, 2017
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Reconciliation of Provision of Income Taxes [Line Items]            
Income taxes at statutory rate       $ 148,585 $ 102,437 $ 116,932
State income taxes       9,038 7,007 8,757
Federal manufacturers deduction       (11,527) (8,425) (10,714)
Excess tax benefits $ 72 $ 852 $ 952 3,345 0 0
Nondeductible expenses       3,506 2,482 3,234
Other, net       630 2,507 744
Change in valuation allowance       (1,106) (954) (431)
Income tax expense       144,785 103,716 118,090
State            
Reconciliation of Provision of Income Taxes [Line Items]            
Income tax credits       (606) (948) (342)
Federal            
Reconciliation of Provision of Income Taxes [Line Items]            
Income tax credits       $ (390) $ (390) $ (90)