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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		9 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic and Diluted Earnings Per Limited Partner:
Net income (loss)		$ (23,098)	$ (8,005)	$ 51,542	$ 76,955
Less General Partner’s interest in net income (loss)		(150)	(49)	319	445
Limited Partners’ interest in net income (loss)		(22,948)	(7,956)	51,223	76,510
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60				6,740	11,610
Limited Partner’s interest in net income (loss) under FASB ASC 260-10-45-60		$ (22,948)	$ (7,956)	$ 44,483	$ 64,900
Per unit data:
Basic and diluted net income (loss) available to limited partners		$ (0.46)	$ (0.15)	$ 1.00	$ 1.39
Less dilutive impact of theoretical distribution of earnings under FASB ASC 260-10-45-60				0.14	0.21
Limited Partner’s interest in net income (loss) under FASB ASC 260-10-45-60	[1]	$ (0.46)	$ (0.15)	$ 0.86	$ 1.18
Weighted average number of Limited Partner units outstanding		49,943	53,938	51,431	55,157
[1] See Note 15 - Earnings Per Limited Partner Unit.

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