Property, Plant and Equipment (Tables)

12 Months Ended

Mar. 31, 2012

Notes To Financial Statements [Abstract]

Property, Plant and Equipment [Table Text Block]

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	3-35
Information Systems	2-17
Radioisotope (cobalt-60)	20

Information related to the major categories of our depreciable assets is as follows:

	March 31, 2012			March 31, 2011
Land and land improvements (1)	$	33,099		$	30,194
Buildings and leasehold improvements	230,823			201,883
Machinery and equipment	301,665			286,103
Information systems	110,130			101,934
Radioisotope	210,899			194,882
Construction in progress (1)	22,811			40,665
Total property, plant, and equipment	909,427			855,661
Less: accumulated depreciation and depletion	(523,018		)	(485,259		)
Property, plant, and equipment, net	$	386,409		$	370,402

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

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Future minimum annual rentals payable under noncancelable operating lease agreements at March 31, 2012 were as follows:

	Operating Leases
2013	$	15,044
2014	12,172
2015	9,840
2016	6,354
2017 and thereafter	4,778
Total Minimum Lease Payments	$	48,188