Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2015	Jul. 31, 2015	Jan. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Payments for Previous Acquisition	$ 3,300
Life Insurance, Corporate or Bank Owned, Amount		$ 35,000
Deferred Compensation Liability, Current and Noncurrent		35,000
Total assets held for sale		0	$ 101,706
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreign currency forward contracts		3,949	9,903
Foreign currency forward contracts		1,183	5,411
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Acquisition-related contingent consideration		0	$ 3,381
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Face Amount		350,000
Senior Notes | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Fair Value Disclosure		$ 361,500