Selected Quarterly Financial Data (Tables)

12 Months Ended

Sep. 30, 2021

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data

	Three Months Ended
	Dec. 31,		Mar. 31,		Jun. 30,			Sep. 30,
(in thousands - except per unit data)	2020		2021		2021			2021			Total
Sales	$	373,320	$	604,115	$	283,100		$	236,551		$	1,497,086
Gross profit for product, installation and service		131,870		226,202		70,091			49,491			477,654
Operating income (loss)		54,786		119,695		(13,764	)		(30,517	)		130,200
Income (loss) before income taxes		52,688		117,316		(15,963	)		(32,629	)		121,412
Net income (loss)		37,860		85,164		(12,054	)		(23,233	)		87,737
Limited Partner interest in net income (loss)		37,564		84,483		(11,956	)		(23,043	)		87,048
Net income (loss) per Limited Partner unit:
Basic and diluted (a)	$	0.74	$	1.71	$	(0.30	)	$	(0.58	)	$	1.82

	Three Months Ended
	Dec. 31,		Mar. 31,		Jun. 30,			Sep. 30,
(in thousands - except per unit data)	2019		2020		2020			2020			Total
Sales	$	508,945	$	543,063	$	232,155		$	183,295		$	1,467,458
Gross profit for product, installation and service		147,603		196,440		84,159			46,818			475,020
Operating income (loss)		42,451		86,117		498			(36,098	)		92,968
Income (loss) before income taxes		39,537		83,108		(2,051	)		(44,051	)		76,543
Net income (loss)		27,755		58,408		(46	)		(30,199	)		55,918
Limited Partner interest in net income (loss)		27,563		57,999		(45	)		(29,976	)		55,541
Net income (loss) per Limited Partner unit:
Basic and diluted (a)	$	0.49	$	1.03	$	—		$	(0.68	)	$	1.07

(a) The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.