Defined Benefit Plans, Input In Calculating Benefits, Years Used To Compute Average Compensation

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- Definition

Minimum years of service for individuals who retire after attaining age 55 who are entitled to receive reduced retirement benefits.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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Employee Benefit Plans - Pension and Other Postretirement Benefits (Details) $ in Millions	12 Months Ended
	Jan. 31, 2020 USD ($) year	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Liability, defined benefit plan, current	$ 9.0	$ 9.0
Pension/postretirement benefit obligations	$ 374.5	312.4
Health care cost trend rate, assumed for next year (percentage)	6.50%
Health care cost trend rate (percentage)	4.75%
Qualified
Defined Benefit Plan Disclosure [Line Items]
Years used to calculate average compensation (years) \| year	5
Service period (years)	10 years
Employer contributions	$ 30.0	$ 11.8	$ 15.0
Qualified \| Equity Securities, Investment Summary
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation (percentage)	50.00%
Qualified \| Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation (percentage)	35.00%
Qualified \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation (percentage)	15.00%
Excess/SRIP
Defined Benefit Plan Disclosure [Line Items]
Service period (years)	10 years