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Interest expense (Tables)
 12 Months Ended
Mar. 31, 2013
Interest Expense [Abstract]  
Schedule of interest expense
Interest expense
Year ended March 31,
 
2013

 
2012

 
2011

Interest on 8 3/4% senior notes and swaps
 
$
—

 
$
—

 
$
1,238

Interest on capital lease obligations
 
1,925

 
425

 
643

Amortization of deferred financing costs
 
1,607

 
1,591

 
1,609

Interest on credit facilities
 
4,414

 
4,547

 
2,992

Interest on Series 1 Debentures
 
15,230

 
15,255

 
15,089

Interest on long term debt
 
$
23,176

 
$
21,818

 
$
21,571

Other interest
 
567

 
328

 
962

 
 
$
23,743

 
$
22,146

 
$
22,533