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Commitments (Tables)
12 Months Ended
Mar. 31, 2012
Commitments [Abstract]  
Future minimum rental payments under non-cancellable operating leases
Leases:  The Company leases manufacturing, laboratory, office and warehouse facilities, equipment and automobiles under operating leases expiring through fiscal 2027.  Rent expense was approximately $39.5 million, $33 million and $35.4 million for fiscal years ended March 31, 2012, 2011 and 2010, respectively.  Future minimum rental payments under noncancellable leases are as follows:

(In thousands)
Years ending March 31,
   
2013
 $41,101 
2014
  33,133 
2015
  24,524 
2016
  19,560 
2017
  19,988 
Thereafter
  95,810 
   $234,116