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Supplemental Financial Information (Tables)
 12 Months Ended
Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Table Text Block]
A summary of additions and deductions related to the allowance for doubtful accounts for the years ended March 31, 2015, 2014 and 2013 follows (amounts in thousands):
 
Balance at Beginning
of Year
 
Charged to
Costs and Expenses
 
 
Deductions (1)
 
Balance at
End of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
2015
$
2,918

 
$
104

 
$
(401
)
 
$
2,621

2014
2,764

 
245

 
(91
)
 
2,918

2013
2,602

 
516

 
(354
)
 
2,764
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables present the changes in the components of accumulated other comprehensive income (AOCI) for the years ended March 31, 2015 and March 31, 2014:
Year ended March 31, 2015
Unrealized Holding Gains (Losses) Available-for-sale Securities
 
Minimum Pension Liability
 
Foreign Currency
 
Total
Balance at March 31, 2014
$
(528
)
 
$
140

 
$
1,439

 
$
1,051

Other comprehensive income (loss) before reclassifications
33,759

 
(127
)
 
(4,322
)
 
29,310

Amounts reclassified from accumulated other comprehensive income (loss)
(18,694
)
 
—

 
—

 
(18,694
)
Net other comprehensive income (loss)
15,065

 
(127
)
 
(4,322
)
 
10,616

Purchase of shares from noncontrolling interest
—

 
—

 
(591
)
 
(591
)
Balance at March 31, 2015
$
14,537

 
$
13

 
$
(3,474
)
 
$
11,076


Year ended March 31, 2014
Unrealized Holding Gains (Losses) Available-for-sale Securities
 
Minimum Pension Liability
 
Foreign Currency
 
Total
Balance at March 31, 2013
$
5,444

 
$
52

 
$
1,439

 
$
6,935

Other comprehensive (loss) income before reclassifications
(4,377
)
 
88

 
—

 
(4,289
)
Amounts reclassified from accumulated other comprehensive (loss) income
(1,595
)
 
—

 
—

 
(1,595
)
Net other comprehensive (loss) income
(5,972
)
 
88

 
—

 
(5,884
)
Balance at March 31, 2014
$
(528
)
 
$
140

 
$
1,439

 
$
1,051
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The table below details where reclassifications of realized transactions out of AOCI are recorded on the Consolidated Statements of Income.
 
Year ended March 31,
 
 
Description of AOCI Component
2015
 
2014
 
2013
 
Related Statement of Income Line
Unrealized gains on available-for-sale securities
$
18,706

 
$
2,371

 
$
394

 
Other income
Taxes
(12
)
 
(776
)
 
(51
)
 
(Provision) benefit for income taxes
Reclassification of realized transactions, net of taxes
$
18,694

 
$
1,595

 
$
343

 
Net Income