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Acquisitions - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 10, 2015 USD ($) T | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Mar. 31, 2015 USD ($) | Nov. 14, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible Assets, Impairment |  | $ 28,354 |  |  | $ 28,354 |  |  |
Operating Loss |  | 56,546 |  | $ 87,995 | 125,908 | $ 154,875 |  |
Intangible Assets |  | 56,200 |  |  | 56,200 |  |  |
Goodwill |  | 133,885 |  |  | 133,885 |  | $ 132,515 |
CRS Proppants [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition purchase price |  |  | $ 236,100 |  |  |  | $ 237,200 |
In-process capital expenditures |  |  |  |  |  |  |  | $ 192,738
Business acquisition reduction in purchase price |  |  | 1,100 |  |  |  |  |
Depreciation and amortization |  | 5,700 |  |  | 11,300 |  |  |
Intangible Assets, Impairment |  | 28,400 |  |  | 28,400 |  |  |
Write-down of raw sand inventory |  | 9,400 |  |  | 9,400 |  |  |
Operating Loss |  | $ (41,257) |  |  | (46,066) |  |  |
Direct acquisition cost |  |  |  | $ 2,100 |  | $ 2,100 |  |
Accounts and notes receivable |  |  |  |  |  |  |  | 14,640
Inventories |  |  |  |  |  |  |  | 9,627
Intangible Assets |  |  |  |  |  |  |  | $ 56,200
CRS Proppants [Member] | Fair Value Adjustment to Inventory |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Operating Loss |  |  |  |  | $ 500 |  |  |
CRS Proppants [Member] | In-Process Capital Expenditures [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
In-process capital expenditures |  |  | $ 8,900 |  |  |  |  |
Skyway Plant [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition purchase price | $ 29,900 |  |  |  |  |  |  |
In-process capital expenditures | $ 24,600 |  |  |  |  |  |  |
Ground granulated blast furnace slag purchased | T | 600,000 |  |  |  |  |  |  |
Business acquisition, refund receivable | $ 2,500 |  |  |  |  |  |  |
Business acquisition, refund receivable period | 18 months |  |  |  |  |  |  |
Accounts and notes receivable | $ 1,900 |  |  |  |  |  |  |
Inventories | 2,300 |  |  |  |  |  |  |
Intangible Assets | 1,200 |  |  |  |  |  |  |
Goodwill | 1,400 |  |  |  |  |  |  |
Other assets | $ 1,000 |  |  |  |  |  |  |

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