Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2015	Jan. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Payments for Previous Acquisition	$ 3,300us-gaap_PaymentsForPreviousAcquisition
Life Insurance, Corporate or Bank Owned, Amount	34,700
Deferred Compensation Liability, Current and Noncurrent	34,600
Total assets held for sale	0	101,706
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Foreign currency forward contracts	2,063	9,903
Foreign currency forward contracts	7,799	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 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Debt Instrument, Fair Value Disclosure	$ 363,400

Amount classified as assets attributable to disposal group held for sale or disposed of.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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