Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 184,800	$ 170,300
Company's expected contribution to defined benefit pension plans in next fiscal year	8,500
Expense for defined contribution plans	$ 14,400	14,400	$ 13,900
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of vested salary and incentive compensation deferrals permitted to eligible employees (as a percent)	100.00%
Investments for deferred compensation plan	$ 29,174	28,213
Deferred Compensation Plan | Other assets
Defined Benefit Plan Disclosure [Line Items]
Investments for deferred compensation plan	29,200	28,200
Deferred Compensation Plan | Other liabilities
Defined Benefit Plan Disclosure [Line Items]
Investments for deferred compensation plan	$ 29,200	$ 28,200
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	33.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	28.00%
Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	28.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	4.00%