Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Commitments and Contingencies      
Annual rental expenses for operating leases $ 10,100,000 $ 9,800,000 $ 10,000,000
Minimum lease payments      
2014 8,663,000    
2015 5,658,000    
2016 2,870,000    
2017 1,265,000    
2018 967,000    
Thereafter 1,733,000    
Sublease rental income      
2014 (251,000)    
2015 (252,000)    
2016 (21,000)    
Net minimum lease payments      
2014 8,412,000    
2015 5,406,000    
2016 2,849,000    
2017 1,265,000    
2018 967,000    
Thereafter $ 1,733,000