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Disaggregation of Revenues and Geographic Information - Summary of Revenues by Geographic Area (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021 USD ($) market	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) market	Jul. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of primary geographical markets | market	2		2
Revenue	$ 1,260,361	$ 1,061,967	$ 2,435,394	$ 2,080,352
United States
Disaggregation of Revenue [Line Items]
Revenue	942,561	805,056	1,826,002	1,567,396
Other countries
Disaggregation of Revenue [Line Items]
Revenue	$ 317,800	$ 256,911	$ 609,392	$ 512,956

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