Goodwill and Other Intangible Assets - Changes in Net Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Changes in the net carrying amount of goodwill
Goodwill as of the beginning of the fiscal period	$ 362,253	$ 225,290
Goodwill acquired	62,252	137,058
Purchase price allocation adjustment	(866)
Translation adjustments	436	(95)
Goodwill as of the end of the fiscal period	424,075	362,253
Professional
Changes in the net carrying amount of goodwill
Goodwill as of the beginning of the fiscal period	350,300
Goodwill as of the end of the fiscal period	412,100	350,300
Other
Changes in the net carrying amount of goodwill
Goodwill as of the beginning of the fiscal period	1,534	0
Goodwill acquired	0	1,534
Purchase price allocation adjustment	0
Translation adjustments	0	0
Goodwill as of the end of the fiscal period	1,534	1,534
Operating Segments | Professional
Changes in the net carrying amount of goodwill
Goodwill as of the beginning of the fiscal period	350,250	214,827
Goodwill acquired	62,252	135,524
Purchase price allocation adjustment	(866)
Translation adjustments	425	(101)
Goodwill as of the end of the fiscal period	412,061	350,250
Operating Segments | Residential
Changes in the net carrying amount of goodwill
Goodwill as of the beginning of the fiscal period	10,469	10,463
Goodwill acquired	0	0
Purchase price allocation adjustment	0
Translation adjustments	11	6
Goodwill as of the end of the fiscal period	$ 10,480	$ 10,469