Acquisition | Allocation of Purchase Price (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Feb. 27, 2017
Business Acquisition [Line Items]
Goodwill	$ 892,990	$ 969,168
TS
Business Acquisition [Line Items]
Cash			$ 176,000
Accounts receivable			1,830,000
Inventories			239,000
Prepaid expenses and other current assets			100,000
Property and equipment, net			62,000
Goodwill			727,000
Intangible assets			919,000
Other assets, net			151,000
Total assets			4,204,000
Other current liabilities			1,169,000
Revolving credit loans and long-term debt			134,000
Other long-term liabilities			99,000
Total liabilities			1,402,000
Purchase price			$ 2,802,000