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Sale/ Leaseback Arrangements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 Vessel | Jun. 30, 2014 Vessel | Sep. 30, 2014 | Sep. 30, 2013
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels sold | 1 | 1 |  |
Proceeds from sale | $ 19,400,000 | $ 13,400,000 | $ 32,751,000 | $ 65,550,000
Deferred gain | 11,200,000 | 9,400,000 | 11,200,000 |
Carrying value | $ 8,200,000 | $ 4,000,000 | $ 8,200,000 |
Reacquisition percentage of original sales price | 47.00% | 61.00% |  |
Length of extension period, months | 24 months | 24 months |  |
Agreement during the first quarter of fiscal 2015 |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease expiration date |  |  | Quarter ending June 2021 |
Agreement during the second quarter of fiscal 2015 |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Lease expiration date |  |  | Quarter ending March 2023 |

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- Definition Sale Leaseback Transaction, Expiration Date + References No definition available. + Details
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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
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- Definition Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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- Definition The net book value of the asset(s) sold in connection with the sale of the property to another party and lease back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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