Fair Value Measurements (Details) - USD ($)	Oct. 31, 2016	Jan. 31, 2016	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Life Insurance, Corporate or Bank Owned, Amount	$ 34,300,000	$ 30,200,000
Deferred Compensation Liability, Current and Noncurrent	34,400,000	30,500,000
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	5,144,000	3,412,000
Foreign currency forward contracts - Liabilities	1,911,000	2,274,000
Senior notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Face Amount	350,000,000	350,000,000	$ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage			3.75%
Senior notes | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Fair Value Disclosure	$ 355,600,000	$ 359,600,000