Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Income tax benefit	$ 1,559	$ (4,741)	$ 33,889	$ (5,588)
Early Adoption of ASU 2019-12
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Income tax benefit			$ 6,200
ASU 2019-12
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Feb. 01, 2020		Feb. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect	false		false
ASU 2018-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, immaterial effect	true		true
ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true		true
Change in accounting principle, accounting standards update, adoption date	Feb. 01, 2020		Feb. 01, 2020
Change in accounting principle, accounting standards update, immaterial effect	true		true