Property, Plant and Equipment - Additional (Details) - USD ($)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 223,600,000	$ 200,800,000	$ 202,500,000
Asset impairment charges	$ 0	$ 10,000,000	$ 25,400,000