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Supplemental Financial Information (Tables)
 12 Months Ended
Mar. 31, 2014
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, 2014, 2013 and 2012 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:
 
 
 
 
 
 
 
2014
$
2,764

 
$
245

 
$
(91
)
 
$
2,918

2013
2,602

 
516

 
(354
)
 
2,764

2012
2,838

 
7

 
(243
)
 
2,602
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table presents the changes in the components of accumulated other comprehensive income (AOCI) for the years ended March 31, 2014 and March 31, 2013:
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


Year ended March 31, 2013
Unrealized Holding Gains (Losses) Available-for-sale Securities
 
Minimum Pension Liability
 
Foreign Currency
 
Total
Balance at March 31, 2012
$
3,101

 
$
—

 
$
—

 
$
3,101

Other comprehensive income before reclassifications
2,686

 
52

 
1,439

 
4,177

Amounts reclassified from accumulated other comprehensive income
(343
)
 
—

 
—

 
(343
)
Net other comprehensive income
2,343

 
52

 
1,439

 
3,834

Balance at March 31, 2013
$
5,444

 
$
52

 
$
1,439

 
$
6,935
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
2014
 
2013
 
2012
 
Related Statement of Income Line
Unrealized gains on available-for-sale securities
$
2,371

 
$
394

 
$
157

 
Other income
Taxes
(776
)
 
(51
)
 
58

 
(Provision) benefit for income taxes
Reclassification of realized transactions, net of taxes
$
1,595

 
$
343

 
$
215

 
Net Income