Earnings Per Limited Partner Unit - Net Income Allocation and Per Unit Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Basic and Diluted Earnings Per Limited Partner:
Net income		$ 32,884	$ 12,979
Less General Partner's interest in net income		307	118
Net income available to limited partners		32,577	12,861
Less dilutive impact of theoretical distribution of earnings	[1]	5,371	1,588
Limited Partner's interest in net income		$ 27,206	$ 11,273
Per unit data:
Basic and diluted net income available to limited partners		$ 0.94	$ 0.36
Less dilutive impact of theoretical distribution of earnings	[1]	0.15	0.04
Limited Partner's interest in net income	[2]	$ 0.79	$ 0.32
Weighted average number of Limited Partner units outstanding, Basic		34,587	35,593
Weighted average number of Limited Partner units outstanding, Diluted		34,587	35,593

[1] In any accounting period where the Company’s aggregate net income exceeds its aggregate distribution for such period, the Company is required to present net income per Limited Partner unit as if all of the earnings for the period were distributed, based on the terms of the Partnership agreement, regardless of whether those earnings would actually be distributed during a particular period from an economic or practical perspective. This allocation does not impact the Company’s overall net income or other financial results.

[2] See Note 15 - Earnings Per Limited Partner Unit.