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Income Tax Expense (Tables)
 12 Months Ended
Mar. 31, 2020
Income Tax Expense [Abstract]  
Schedule of Deferred Tax Assets and Liabilities The significant components of the deferred tax assets and liabilities recorded in our accompanying balance sheets at March 31, 2020 and 2019 were as follows:
March 31,20202019
Deferred Tax Assets:
Post-retirement benefit accrual$2,871 $3,142 
Compensation12,560 14,275 
Net operating loss carryforwards16,149 19,195 
Accrued expenses5,490 4,858 
Insurance3,620 3,187 
Deferred income11,316 7,509 
Bad debt1,820 1,386 
Pension2,273 3,364 
Operating leases (1)
28,945 — 
Other6,024 7,707 
Deferred Tax Assets91,068 64,623 
Less: Valuation allowance13,891 13,478 
Total Deferred Tax Assets77,177 51,145 
Deferred Tax Liabilities:
Depreciation and depletion68,179 61,060 
Operating leases (1)
29,268 — 
Intangibles129,951 128,479 
Other2,078 2,197 
Total Deferred Tax Liabilities229,476 191,736 
Net Deferred Tax Assets (Liabilities)$(152,299)$(140,591)
Schedule of Income before Income Tax, Domestic and Foreign Income from continuing operations before income taxes was as follows:
Years Ended March 31,202020192018
United States operations$325,522 $235,405 $203,872 
Ireland operations29,543 13,693 11,837 
Other locations operations143,616 120,372 139,273 
$498,681 $369,470 $354,982 
Schedule of Components of Income Tax Expense (Benefit) The components of the provision for income taxes related to income from continuing operations consisted of the following:
Years Ended March 31,202020192018
Current:
United States federal$42,032 $29,943 $47,728 
United States state and local9,971 12,484 7,727 
Ireland5,036 2,627 2,596 
Other locations24,600 26,824 26,742 
81,639 71,878 84,793 
Deferred:
United States federal10,073 5,775 (15,728)
United States state and local2,363 2,836 2,656 
Ireland(899)(546)(280)
Other locations(2,300)(15,549)(8,081)
9,237 (7,484)(21,433)
Total Provision for Income Taxes$90,876 $64,394 $63,360 
provision for taxes rate reconciliation The total provision for income taxes can be reconciled to the tax computed at the Ireland statutory tax rate for 2020 and 2019, and the United Kingdom statutory rate for 2018 as follows:
Years Ended March 31,202020192018
National statutory tax rate12.5 %12.5 %19.0 %
Increase (decrease) in accruals for uncertain tax positions(0.3)%— %0.1 %
U.S. state and local taxes, net of federal income tax benefit2.0 %3.1 %2.3 %
Increase in valuation allowances 0.5 %0.4 %0.1 %
U.S. research and development credit(0.5)%(0.6)%(0.5)%
U.S. foreign income tax credit(0.6)%(0.2)%(0.2)%
Difference in non-Ireland tax rates6.9 %4.5 %— %
Difference in non-United Kingdom tax rates— %— %4.1 %
U.S. manufacturing deduction— %— %(0.8)%
Excess tax benefit for equity compensation(2.8)%(2.2)%(1.8)%
Tax rate changes on deferred tax assets and liabilities0.1 %(0.6)%(10.3)%
 U.S. transition tax on foreign earnings — %(0.3)%4.9 %
 U.S. tax reform impact, GILTI and FDII0.1 %0.3 %— %
Acquisitions and divestitures— %— %0.5 %
Capitalized acquisition, redomiciliation costs0.1 %0.5 %— %
All other, net0.2 %— %0.4 %
Total Provision for Income Taxes18.2 %17.4 %17.8 %
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible A reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits is as follows:
20202019
Unrecognized Tax Benefits Balance at April 1$2,314 $2,500 
Increases for tax provisions of current year176 178 
Decreases for tax provisions of prior year(1,570)(186)
Other, including currency translation(45)(178)
Unrecognized Tax Benefits Balance at March 31$875 $2,314