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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2017 | Sep. 30, 2016
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash, cash equivalents, and restricted cash |  | $ 35,679,000 | $ 53,145,000 |  | $ 52,708,000 | $ 139,188,000
Cash and cash equivalents |  | 35,429,000 |  |  | 52,458,000 |
Restricted cash |  | 250,000 |  |  | 250,000 |
Captive insurance collateral, debt securities |  | 43,900,000 |  |  | 11,300,000 |
Cash deposit in support of liability | $ 34,200,000 |  |  |  |  |
Accrued expenses and other current liabilities |  | 122,564,000 |  |  | 108,449,000 |
Other long-term liabilities |  | $ 22,613,000 |  |  | 23,659,000 |
Operating lease expiration year |  | 2032 |  |  |  |
Undiscounted future minimum lease payments through 2032 |  | $ 128,200,000 |  |  |  |
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 |  | 17,200,000 |  |  |  |
New England Teamsters & Trucking Industry Pension Fund | Significant Other Observable Inputs Level 2 |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Multiemployer plan discounted withdrawal liability |  | 21,800,000 |  |  |  |
Subsidiaries of Swiss Re |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Additional payment obligated to pay if degree days exceed ten year average |  | 5,000,000 |  |  |  |
Subsidiaries of Swiss Re | Scenario forecast |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maximum payout |  |  |  | $ 5,000,000 |  |
Subsidiaries of Swiss Re | Delivery and branch expenses |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Charge on weather hedge contract |  | 1,900,000 |  |  |  |
Charge or benefit on weather hedge contract |  |  | $ 0 |  |  |
Mutual Funds |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Captive insurance collateral, net asset value |  | $ 1,300,000 |  |  | $ 500,000 |
Maximum |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash equivalents, highly liquid investments maturity |  | 3 months |  |  |  |
Maximum | Subsidiaries of Swiss Re | Scenario forecast |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Derivative maximum receivable |  |  |  | $ 12,500,000 |  |

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