CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows provided by (used in) operating activities:
Net income	$ 64,029	$ 82,882
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in fair value of derivative instruments	(20,071)	(9,756)
Depreciation and amortization	20,893	19,788
Provision for losses on accounts receivable	(140)	5,062
Change in deferred taxes	13,299	8,598
Changes in operating assets and liabilities:
(Increase) decrease in receivables	647	(17,730)
Decrease in inventories	13,402	12,691
Decrease in other assets	968	1,759
Decrease in accounts payable	(2,173)	(6,984)
Decrease in customer credit balances	(2,026)	(26,595)
Increase in other current and long-term liabilities	21,357	26,456
Net cash provided by operating activities	110,185	96,171
Cash flows provided by (used in) investing activities:
Capital expenditures	(7,230)	(5,227)
Proceeds from sales of fixed assets	303	212
Acquisitions	(8,829)	(1,069)
Net cash used in investing activities	(15,756)	(6,084)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings		12,296
Revolving credit facility repayments		(12,296)
Repayment of term loan	(5,000)
Distributions	(17,097)	(15,747)
Unit repurchases	(707)	(691)
Customer retainage payments	(680)
Payments of debt issuance costs	(297)
Net cash used in financing activities	(23,781)	(16,438)
Net increase in cash and cash equivalents	70,648	73,649
Cash and cash equivalents at beginning of period	100,508	48,999
Cash and cash equivalents at end of period	$ 171,156	$ 122,648