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Nature of Operations and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Impact of ASC 2014-09 Adoption [Table Text Block]
 
As Reported March 31,
Total
ASC 605 March 31,
Balance Sheet
2019
Adjustments
2019
 
 
 
 
Total assets
$
5,073,071

$
(8,429
)
$
5,064,642

Total liabilities
1,887,273

(14,448
)
1,872,825

Total equity
3,185,798

6,019

3,191,817
Cash Flow, Supplemental Disclosures
Information supplementing our Consolidated Statements of Cash Flows is as follows:
Years Ended March 31,
 
2019
 
2018
 
2017
Cash paid during the year for:
 
 
 
 
 
 
Interest
 
$
44,118

 
$
48,663

 
$
42,797

Income taxes
 
64,668

 
85,629

 
78,009

Cash received during the year for income tax refunds
 
2,189

 
7,747

 
2,002
Property, Plant and Equipment
We generally depreciate or deplete property, plant, and equipment over the useful lives presented in the following table:
Asset Type
 
Useful Life
(years)
Land improvements
 
3-40

Buildings and leasehold improvements
 
2-50

Machinery and equipment
 
2-20

Information Systems
 
2-20

Radioisotope (cobalt-60)
 
20


Information related to the major categories of our depreciable assets is as follows:
 March 31,
 
2019
 
2018
Land and land improvements (1)
 
$
63,522

 
$
55,417

Buildings and leasehold improvements
 
480,359

 
467,063

Machinery and equipment
 
656,956

 
631,623

Information systems
 
169,711

 
151,360

Radioisotope
 
483,080

 
458,440

Construction in progress (1)
 
133,689

 
87,745

Total property, plant, and equipment
 
1,987,317

 
1,851,648

Less: accumulated depreciation and depletion
 
(955,735
)
 
(841,124
)
Property, plant, and equipment, net
 
$
1,031,582

 
$
1,010,524

(1) Land is not depreciated. Construction in progress is not depreciated until placed in service.