Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Feb. 27, 2017	Jan. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Life Insurance, Corporate or Bank Owned, Amount	$ 43,100		$ 35,200
Deferred Compensation Liability, Current and Noncurrent	43,100		35,300
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash Equivalents, Fair Value Disclosure	0		1,000,010
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	3,713		2,264
Foreign currency forward contracts - Liabilities	8,787		9,711
Senior Notes | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Fair Value Disclosure	1,393,000		$ 1,354,000
Term loan credit agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Face Amount		$ 1,000,000
Other Loans Payable, Long-term, Noncurrent	$ 800,000