Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Life Insurance, Corporate or Bank Owned, Amount	$ 44,300	$ 44,800
Deferred Compensation Liability, Current and Noncurrent	44,300	44,700
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreign currency forward contracts - Assets	6,112	5,025
Foreign currency forward contracts - Liabilities	5,973	11,675
Senior Notes | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Fair Value Disclosure	$ 986,000	$ 1,020,000