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Condensed Financial Information of Registrant Balance Sheets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | --- | ---
Current assets |  |  |  |  |
Cash and cash equivalents |  | $ 14,531 | $ 52,458 |  |
Prepaid expenses and other current assets |  | 35,451 | 26,652 |  |
Total current assets |  | 256,737 | 241,241 |  |
Total assets |  | 729,971 | 673,917 |  |
Current liabilities |  |  |  |  |
Accrued expenses |  | 116,436 | 108,449 |  |
Total current liabilities |  | 283,188 | 272,333 |  |
Partners’ capital |  | 309,785 | 306,068 | $ 301,493 | $ 289,886
Total liabilities and partners’ capital |  | 729,971 | 673,917 |  |
STAR GROUP, L.P. |  |  |  |  |
Current assets |  |  |  |  |
Cash and cash equivalents |  | 54 | 54 | $ 324 | $ 324
Prepaid expenses and other current assets |  | 217 | 207 |  |
Total current assets |  | 271 | 261 |  |
Investment in subsidiaries | [1] | 309,541 | 306,016 |  |
Total assets |  | 309,812 | 306,277 |  |
Current liabilities |  |  |  |  |
Accrued expenses |  | 27 | 209 |  |
Total current liabilities |  | 27 | 209 |  |
Partners’ capital |  | 309,785 | 306,068 |  |
Total liabilities and partners’ capital |  | $ 309,812 | $ 306,277 |  |
[1] | Investments in Star Acquisitions, Inc. and subsidiaries are recorded in accordance with the equity method of accounting.

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