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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 |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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