Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income (loss)	$ (68,979)	$ 941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	138,832	81,092
Stock-based compensation	8,264	7,835
Certain interest expense and other financing costs	6,051	3,987
Beneficial lease amortization	1,145	0
Loss on debt extinguishment	0	1,725
Gain on sale of fixed assets	(1,172)	(319)
Deferred income taxes	3,086	(47,260)
Changes in operating assets and liabilities, net of the effects of businesses acquired in the period:
Accounts receivable	219,740	186,170
Inventories	(96,052)	(131,789)
Prepaid expenses and other assets	(85,320)	67,425
Accounts payable and accrued expenses	(368,154)	(130,695)
Other liabilities	415	854
Net cash provided by (used in) operating activities	(242,144)	39,966
Investing Activities
Purchases of property and equipment	(26,320)	(24,833)
Acquisition of businesses, net	(163,973)	(2,726,561)
Proceeds from the sale of assets	1,428	413
Net cash provided by (used in) investing activities	(188,865)	(2,750,981)
Financing Activities
Borrowings under revolving lines of credit	1,880,684	1,530,667
Repayments under revolving lines of credit	(1,557,615)	(1,097,463)
Borrowings under term loan	0	970,000
Repayments under term loan	(4,850)	(441,000)
Borrowings under senior notes	0	1,300,000
Payment of debt issuance costs	0	(67,723)
Repayments under equipment financing facilities and other	(2,642)	(5,643)
Proceeds from issuance of convertible preferred stock	0	400,000
Payment of stock issuance costs	0	(1,279)
Payment of dividends on preferred stock	(12,000)	(978)
Proceeds from issuance of common stock related to equity awards	1,559	5,317
Taxes paid related to net share settlement of equity awards	(3,617)	(3,933)
Net cash provided by (used in) financing activities	301,519	2,587,965
Effect of exchange rate changes on cash and cash equivalents	208	800
Net increase (decrease) in cash and cash equivalents	(129,282)	(122,250)
Cash and cash equivalents, beginning of period	129,927	138,250
Cash and cash equivalents, end of period	645	16,000
Cash paid during the period for:
Interest	77,336	28,659
Income taxes paid (received), net of refunds	(11,073)	33,037
Supplemental Disclosure of Non-cash Financing Activity
Preferred stock dividends, accrued and unpaid	$ 0	$ 5,022