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Long-Term Debt (Schedule of debt) (detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt $ 332,633 $ 315,539
Total 332,633 315,539
Current Portion of Long-Term Debt 3,495 279,572
Long-Term Debt, Less Current Portion 329,138 35,967
Revolving credit facility [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 214,781 $ 271,592
Long-term Debt, Weighted Average Interest Rate 2.22% 1.95%
Debt Instrument, Maturity Date 2022  
Total $ 214,781 $ 271,592
Secured Industrial Revenue Development Bonds [Member]    
Debt Instrument [Line Items]    
Long-term Debt   $ 22,630
Long-term Debt, Weighted Average Interest Rate   3.02%
Total   $ 22,630
Secured Industrial Revenue Development Bond [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 999 $ 1,200
Long-term Debt, Weighted Average Interest Rate 2.00% 2.00%
Debt Instrument, Maturity Date 2021  
Total $ 999 $ 1,200
Secured promissory note 1 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 10,340 $ 12,114
Long-term Debt, Weighted Average Interest Rate 6.98% 6.98%
Debt Instrument, Maturity Date 2022  
Total $ 10,340 $ 12,114
Secured promissory note 2 [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 1,782 $ 2,474
Long-term Debt, Weighted Average Interest Rate 6.35% 6.35%
Debt Instrument, Maturity Date 2020  
Total $ 1,782 $ 2,474
Other [Member]    
Debt Instrument [Line Items]    
Long-term Debt 216 216
Total 216 216
Lease financing obligations [Member}    
Debt Instrument [Line Items]    
Long-term Debt $ 4,679 $ 5,313
Long-term Debt, Weighted Average Interest Rate 2.62% 2.62%
Debt Instrument, Maturity Date 2020  
Total $ 4,679 $ 5,313
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 99,836  
Long-term Debt, Weighted Average Interest Rate 3.38%  
Debt Instrument, Maturity Date 2022  
Total $ 99,836