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

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Long Term Debt Table (Details) $ in Millions, ¥ in Billions	12 Months Ended
	Jan. 31, 2019 USD ($)	Jan. 31, 2019 JPY (¥)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Aug. 31, 2016 JPY (¥)	Jan. 31, 2013 USD ($)
Debt Instrument [Line Items]
Long-term debt, including current maturities			$ 891.8	$ 891.9
Less unamortized discounts and debt issuance costs			8.4	9.0
Long-term debt			883.4	882.9
2012 4.40% Series B Notes, due July 2042
Debt Instrument [Line Items]
Long-term debt, including current maturities			$ 250.0	250.0
Interest rate, stated percentage		4.40%	4.40%
Periodic payment of principal	$ 50.0
Debt, face amount						$ 250.0
2014 3.80% Senior Notes, due October 2024
Debt Instrument [Line Items]
Long-term debt, including current maturities			$ 250.0	250.0
Interest rate, stated percentage		3.80%	3.80%
2014 4.90% Senior Notes, due October 2044
Debt Instrument [Line Items]
Long-term debt, including current maturities			$ 300.0	300.0
Interest rate, stated percentage		4.90%	4.90%
2016 0.78% Senior Notes, due August 2026
Debt Instrument [Line Items]
Long-term debt, including current maturities			$ 91.8	$ 91.9
Interest rate, stated percentage		0.78%	0.78%
Debt, face amount		¥ 10.0	$ 91.8		¥ 10.0