Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income	$ 11,074	$ 1,399
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	56,955	47,644
Stock-based compensation	7,574	10,696
Certain interest expense and other financing costs	2,703	4,053
Gain on sale of fixed assets	(420)	(411)
Deferred income taxes	2,020	1,741
Other, net	131	(280)
Changes in operating assets and liabilities, net of the effects of businesses acquired:
Accounts receivable	123,590	95,150
Inventories	(92,072)	(2,519)
Prepaid expenses and other assets	(53,062)	(15,815)
Accounts payable and accrued expenses	91,950	(61,006)
Net cash provided by operating activities	150,443	80,652
Investing Activities
Purchases of property and equipment	(24,231)	(11,059)
Acquisition of businesses, net	(58,359)	(941,156)
Proceeds from the sale of assets	1,285	377
Net cash used in investing activities	(81,305)	(951,838)
Financing Activities
Borrowings under revolving lines of credit	857,099	1,017,128
Repayments under revolving lines of credit	(948,470)	(724,855)
Borrowings under term loan	0	450,000
Repayments under term loan	(1,125)	(187,875)
Borrowings under Senior Notes	0	300,000
Borrowings under equipment financing facilities and other	1,579	0
Repayments under equipment financing facilities and other	(6,857)	(2,633)
Payment of deferred financing costs	0	(27,813)
Proceeds from issuance of common stock	7,840	15,391
Taxes paid related to net share settlement of equity awards	(697)	0
Excess tax benefit from stock-based compensation	0	1,630
Net cash provided by (used in) financing activities	(90,631)	840,973
Effect of exchange rate changes on cash and cash equivalents	119	(607)
Net decrease in cash and cash equivalents	(21,374)	(30,820)
Cash and cash equivalents, beginning of period	31,386	45,661
Cash and cash equivalents, end of period	10,012	14,841
Cash paid during the period for:
Interest	29,592	22,210
Income taxes, net of tax refunds	$ 36,151	$ 13,728