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Long-Term Debt (Schedule of debt) (detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt $ 315,539 $ 274,164
Total 315,539 274,164
Current Portion of Long-Term Debt 279,572 2,530
Long-Term Debt, Less Current Portion 35,967 271,634
Revolving credit facility [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 271,592 $ 233,000
Long-term Debt, Weighted Average Interest Rate 1.95% 1.92%
Debt Instrument, Maturity Date 2017  
Total $ 271,592 $ 233,000
Secured Industrial Revenue Development Bonds [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 22,630 $ 22,630
Long-term Debt, Weighted Average Interest Rate 3.02% 2.97%
Debt Instrument, Maturity Date 2029  
Total $ 22,630 $ 22,630
Secured Industrial Revenue Development Bond [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 1,200 $ 1,398
Long-term Debt, Weighted Average Interest Rate 2.00% 2.00%
Debt Instrument, Maturity Date 2021  
Total $ 1,200 $ 1,398
Secured promissory note 1 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 12,114 $ 13,769
Long-term Debt, Weighted Average Interest Rate 6.98% 6.98%
Debt Instrument, Maturity Date 2022  
Total $ 12,114 $ 13,769
Secured promissory note 2 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 2,474 $ 3,122
Long-term Debt, Weighted Average Interest Rate 6.35% 6.35%
Debt Instrument, Maturity Date 2020  
Total $ 2,474 $ 3,122
Other [Member]    
Debt Instrument [Line Items]    
Long-term Debt 216 245
Total 216 $ 245
Lease financing obligations [Member}    
Debt Instrument [Line Items]    
Long-term Debt $ 5,313  
Long-term Debt, Weighted Average Interest Rate 2.62%  
Debt Instrument, Maturity Date 2020  
Total $ 5,313