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Schedule of Intangible Assets, Including Impact of Impairment Charges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Amortization Expense |  |  | $ 12,911 | $ 5,700 | $ 1,700
Intangible Assets, Impairment | $ 6,600 | $ 28,400 | 34,999 |  |
Intangible Assets, Accumulated Amortization | (61,258) |  | (61,258) | (13,348) |
Goodwill, Cost | 133,885 |  | 133,885 | 132,515 |
Goodwill, Net | 133,885 |  | 133,885 | 132,515 |
Total Goodwill and Intangible Assets, Cost | 227,085 |  | 227,085 | 224,515 |
Total Goodwill and Intangible Assets, Impairment |  |  | 34,999 |  |
Total Goodwill and Intangible Assets, Net | 165,827 |  | 165,827 | 211,167 |
Customer Contracts And Relationships [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 63,260 |  | 63,260 | 62,060 |
Intangible Assets, Amortization Expense |  |  | 11,634 |  |
Intangible Assets, Impairment |  |  | 34,999 |  |
Intangible Assets, Accumulated Amortization | (52,627) |  | (52,627) | (5,994) |
Intangible Assets, Net | 10,633 |  | $ 10,633 | $ 56,066 |
Intangible Assets, Useful Life |  |  | 15 years | 15 years |
Sales Contracts [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 2,500 |  | $ 2,500 | $ 2,500 |
Intangible Assets, Amortization Expense |  |  | 625 |  |
Intangible Assets, Accumulated Amortization | (2,083) |  | (2,083) | (1,458) |
Intangible Assets, Net | 417 |  | $ 417 | $ 1,042 |
Intangible Assets, Useful Life |  |  | 4 years | 4 years |
Permits [Member] |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible Assets, Cost | 27,440 |  | $ 27,440 | $ 27,440 |
Intangible Assets, Amortization Expense |  |  | 652 |  |
Intangible Assets, Accumulated Amortization | (6,548) |  | (6,548) | (5,896) |
Intangible Assets, Net | $ 20,892 |  | $ 20,892 | $ 21,544 |
Intangible Assets, Useful Life |  |  | 40 years | 40 years |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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