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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]      
Asset Retirement Obligation $ 12,386 $ 11,639 $ 9,953
Asset Retirement Obligation, Liabilities Incurred 1,033 89  
Asset Retirement Obligation, Liabilities Settled   (352)  
Asset Retirement Obligation, Accretion Expense 385 1,198  
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) (671) 751  
Land [1] 63,522 55,417  
Buildings and Improvements, Gross 480,359 467,063  
Machinery and Equipment, Gross 656,956 631,623  
Capitalized Computer Software, Gross 169,711 151,360  
Materials, Supplies, and Other 483,080 458,440  
Construction in Progress, Gross [1] 133,689 87,745  
Property, Plant and Equipment, Gross 1,987,317 1,851,648  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (955,735) (841,124)  
Property, Plant and Equipment, Net 1,031,582 1,010,524  
Depreciation 127,174 108,137 119,536
Operating Leases, Rent Expense 30,319 $ 30,474 $ 32,740
Operating Leases, Future Minimum Payments Due, Current 24,008    
Operating Leases, Future Minimum Payments, Due in Two Years 18,567    
Operating Leases, Future Minimum Payments, Due in Three Years 13,917    
Operating Leases, Future Minimum Payments, Due in Four Years 11,929    
Operating Leases, Future Minimum Payments, Due Thereafter 93,939    
Operating Leases, Future Minimum Payments Due $ 162,360    
[1] Land is not depreciated. Construction in progress is not depreciated until placed in service.