Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income (loss)		$ 941	$ 11,074
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		81,092	56,955
Stock-based compensation		7,835	7,574
Certain interest expense and other financing costs		3,987	2,703
Loss on debt extinguishment		1,725	0
Gain on sale of fixed assets		(319)	(420)
Deferred income taxes	[1]	(47,260)	2,020
Other, net		0	131
Changes in operating assets and liabilities, net of the effects of businesses acquired:
Accounts receivable		186,170	123,590
Inventories		(131,789)	(92,072)
Prepaid expenses and other assets		67,425	(53,062)
Accounts payable and accrued expenses		(130,695)	91,950
Other liabilities		854	87
Net cash provided by (used in) operating activities		39,966	150,530
Investing Activities
Purchases of property and equipment		(24,833)	(24,231)
Acquisition of businesses, net		(2,726,561)	(58,359)
Proceeds from the sale of assets		413	1,285
Net cash provided by (used in) investing activities		(2,750,981)	(81,305)
Financing Activities
Borrowings under revolving lines of credit		1,530,667	857,099
Repayments under revolving lines of credit		(1,097,463)	(948,470)
Borrowings under term loan		970,000	0
Repayments under term loan		(441,000)	(1,125)
Borrowings under senior notes		1,300,000	0
Payment of debt issuance costs		(67,723)	0
Repayments under equipment financing facilities and other		(5,643)	(5,365)
Proceeds from issuance of convertible preferred stock		400,000	0
Payment of stock issuance costs		(1,279)	0
Payment of dividends on preferred stock		(978)	0
Proceeds from issuance of common stock related to equity awards		5,317	7,840
Taxes paid related to net share settlement of equity awards		(3,933)	(697)
Net cash provided by (used in) financing activities		2,587,965	(90,718)
Effect of exchange rate changes on cash and cash equivalents		800	119
Net increase (decrease) in cash and cash equivalents		(122,250)	(21,374)
Cash and cash equivalents, beginning of period		138,250	31,386
Cash and cash equivalents, end of period		16,000	10,012
Cash paid during the period for:
Interest		28,659	29,592
Income taxes, net of tax refunds		33,037	36,151
Supplemental disclosure of non-cash financing activity
Preferred stock dividends, accrued and unpaid		$ 5,022	$ 0

[1] Includes impact of provisional amounts recognized relating to estimated impact of Tax Cuts and Jobs Act of 2017 – see Note 12