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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017 | Jan. 01, 2007 | May 01, 2006 | Jan. 01, 2005 | Mar. 01, 2002 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 1995
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit cost expected In next fiscal year |  |  |  |  |  |  |  | $ 3.3 |  |  |
Defined benefit plan, benefit obligation |  |  |  |  |  |  |  | 72.7 | $ 61.0 | $ 50.4 |
Defined benefit plan, expected future benefit payments, next twelve months |  |  |  |  |  |  |  | 1.3 |  |  |
Amount of company contributions |  |  |  |  |  |  |  | 8.6 | 8.8 | 8.2 |
Overlapping Stock Purchase Period 1 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Overlapping period on purchase of common stock under purchase plan (in number of months) |  |  |  |  |  |  | 24 months |  |  |  |
Overlapping Stock Purchase Period 2 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Overlapping period on purchase of common stock under purchase plan (in number of months) |  |  |  |  |  |  | 18 months |  |  |  |
Overlapping Stock Purchase Period 3 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Overlapping period on purchase of common stock under purchase plan (in number of months) |  |  |  |  |  |  | 12 months |  |  |  |
Overlapping Stock Purchase Period 4 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Overlapping period on purchase of common stock under purchase plan (in number of months) |  |  |  |  |  |  | 6 months |  |  |  |
Supplemental employee retirement plans, defined benefit |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, benefit obligation |  |  |  |  |  |  |  | 3.7 |  |  |
Defined benefit plan, expected future benefit payments, next twelve months |  |  |  |  |  |  |  | 0.4 |  |  |
Defined benefit plan, expected future benefit payments, year two through year ten |  |  |  |  |  |  |  | $ 4.1 |  |  |
Defined contribution pension |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of employee's base salary allowed as employee contribution (in hundredths) |  |  |  |  |  |  |  | 60.00% |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Termination benefits, salary period |  |  |  |  |  |  |  | 1 month |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Termination benefits, salary period |  |  |  |  |  |  |  | 5 months |  |  |
Employee stock purchase plan, 2001 plan |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of fair market value of common stock for employee purchase (in hundredths) |  |  |  |  |  |  | 85.00% |  |  |  |
Number of additional shares reserved under purchase plan (in shares) | 1,184,815 | 0 | 1,077,150 |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  |  |  |  |  |  |  | 14,557,319 |  |  |
Shares issued under purchase plan (in shares) |  |  |  |  |  |  |  | 8,293,815 |  |  |
Employee stock purchase plan, 2001 plan | Maximum |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum automatic increase in number of common stock shares under purchase plan (in shares) |  |  |  |  |  | 1,500,000 |  |  |  |  |
Percentage of outstanding shares of common stock used to determine automatic annual increase in common stock (in hundredths) |  |  |  |  |  | 0.50% |  |  |  |  |
Employee Stock Purchase Plan Employees In Non Us Locations |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of fair market value of common stock for employee purchase (in hundredths) |  |  |  |  | 85.00% |  |  |  |  |  |
Number of additional shares reserved under purchase plan (in shares) | 236,963 | 0 | 215,430 |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  |  |  |  |  |  |  | 2,156,176 |  |  |
Shares issued under purchase plan (in shares) |  |  |  |  |  |  |  | 1,524,674 |  |  |
Percentage of fair market value of common stock at the beginning or end of semi-annual purchase plan period, during fiscal 1995 (in hundredths) |  |  |  |  |  |  |  |  |  |  | 100.00%
Employee Stock Purchase Plan Employees In Non Us Locations | Maximum |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares of common stock used to determine automatic annual increase in common stock (in hundredths) |  |  |  | 0.10% |  |  |  |  |  |  |
Management incentive compensation plan |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense charged against operations |  |  |  |  |  |  |  | $ 18.7 | 48.1 | 41.5 |
Cash bonus plan |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement, by type of deferred compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense charged against operations |  |  |  |  |  |  |  | $ 16.4 | $ 36.3 | $ 28.2 |

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- Definition Amount of benefits expected to be paid in the nine fiscal years after the first fiscal year following the latest fiscal year from a defined benefit plan. + References No definition available. + Details
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- Definition The total amount of expected net periodic benefit cost for defined benefit plans for the next fiscal year. Period benefit costs include the following components: service cost, interest cost, prior service cost or credit, actuarial gain (loss), gain (loss) due to settlements or curtailments. + References No definition available. + Details
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