Revenue from Contracts with Customers - Significant Changes in Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Contract Liabilities
Contract Liabilities, balance beginning of period	$ 526,042	$ 249,950
Performance obligations satisfied during the period that were included in the contract liability balance at the beginning of the period	(407,004)	(228,167)
Increases due to invoicing prior to satisfaction of performance obligations	435,674	270,759
Increases from a business combination		233,500
Contract Liabilities, balance end of period	$ 554,712	$ 526,042