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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash, cash equivalents, and restricted cash |  | $ 53,145,000 | $ 139,188,000 | $ 146,614,000 | $ 100,508,000
Cash and cash equivalents |  | 52,895,000 | 139,188,000 |  |
Restricted cash |  | 300,000 |  |  |
Accrued expenses and other current liabilities |  | 138,509,000 | 103,855,000 |  |
Other long-term liabilities |  | 25,728,000 | 25,255,000 |  |
Deferred charges and other assets, net |  | 9,946,000 | 11,074,000 |  |
Long-term debt |  | $ 70,567,000 | 75,441,000 |  |
Operating lease expiration year |  | 2032 |  |  |
Undiscounted future minimum lease payments through 2032 |  | $ 118,900,000 |  |  |
New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accrued expenses and other current liabilities |  | 200,000 |  |  |
Other long-term liabilities |  | 17,400,000 |  |  |
Significant Other Observable Inputs Level 2 | New England Teamsters & Trucking Industry Pension Fund |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Multiemployer plan discounted withdrawal liability |  | 21,700,000 |  |  |
Quoted Prices in Active Markets for Identical Assets Level 1 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments, debt securities |  | 11,300,000 |  |  |
Investments, mutual funds |  | 300,000 |  |  |
Accounting Standards Update 2015-03 |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred charges and other assets, net |  |  | 11,100,000 |  |
Long-term debt |  |  | 75,400,000 |  |
Accounting Standards Update 2015-03 | Scenario, Previously Reported |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred charges and other assets, net |  |  | 11,900,000 |  |
Long-term debt |  |  | $ 76,300,000 |  |
Subsidiaries of Swiss Re |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Weather hedge contracts, payment entitled to be received per heating degree-day shortfall |  | $ 35,000 |  |  |
Percentage in heating degree days less than ten year average that is covered |  | 92.50% |  |  |
Derivative maximum payout |  | $ 12,500,000 |  |  |
Subsidiaries of Swiss Re | Delivery and branch expenses |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |
Credit on weather hedge contract | $ 12,500,000 | $ 0 |  |  |

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