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Revenue Recognition - Schedule of Impact of Adoption on Condensed Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Sales: |  |  |
Total sales |  | $ 535,027 | $ 436,834
Cost and expenses: |  |  |
Delivery and branch expenses |  | 102,673 | 91,204
Operating income |  | 6,063 | 31,066
Income before income taxes |  | 3,288 | 28,670
Income tax expense |  | 973 | (1,512)
Net income |  | 2,315 | 30,182
General Partner’s interest in net income |  | 15 | 175
Limited Partners’ interest in net income |  | $ 2,300 | $ 30,007
Basic and diluted income per Limited Partner Unit | [1] | $ 0.04 | $ 0.45
Balances Without Adoption of ASC 606 | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | $ 536,947 |
Cost and expenses: |  |  |
Delivery and branch expenses |  | 105,209 |
Operating income |  | 5,447 |
Income before income taxes |  | 2,672 |
Income tax expense |  | 791 |
Net income |  | 1,881 |
General Partner’s interest in net income |  | 13 |
Limited Partners’ interest in net income |  | $ 1,868 |
Basic and diluted income per Limited Partner Unit |  | $ 0.04 |
Effect of Change Higher/(Lower) | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | $ (1,920) |
Cost and expenses: |  |  |
Delivery and branch expenses |  | (2,536) |
Operating income |  | 616 |
Income before income taxes |  | 616 |
Income tax expense |  | 182 |
Net income |  | 434 |
General Partner’s interest in net income |  | 2 |
Limited Partners’ interest in net income |  | 432 |
Product |  |  |
Sales: |  |  |
Total sales |  | 458,707 | $ 366,734
Product | Balances Without Adoption of ASC 606 | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | 462,153 |
Product | Effect of Change Higher/(Lower) | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | (3,446) |
Installations and services |  |  |
Sales: |  |  |
Total sales |  | 76,320 | $ 70,100
Installations and services | Balances Without Adoption of ASC 606 | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | 74,794 |
Installations and services | Effect of Change Higher/(Lower) | ASU 2014-09 |  |  |
Sales: |  |  |
Total sales |  | $ 1,526 |
[1] | See Note 15 - Earnings Per Limited Partner Unit.

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