Acquisition, Integration and Restructuring Expenses | TS Acquisition (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Business Acquisition
Business Acquisition, Effective Date of Acquisition	Feb. 27, 2017
Acquisition, integration and restructuring expenses		$ 5,209	$ 13,297	$ 11,430	$ 46,522
TS
Business Acquisition
Payments to Acquire Businesses, Gross	$ 2,500,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	2,785,402
Business Combination, Consideration Transferred	$ 2,800,000
Acquisition, integration and restructuring expenses			$ 562		28,179
Deferred Other Tax Expense (Benefit)					(12,800)
Working Capital Adjustment Gain/Loss [Domain] | TS
Business Acquisition
Acquisition, integration and restructuring expenses					$ (9,600)