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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net income (loss) $ 13,443 $ (3,083)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 16,541 6,500
Provision for doubtful accounts (169) 28
Share-based compensation expense 8,170 5,881
Deemed repatriation transition tax 0 24,641
Deferred income tax (expense) benefit (12,925) 13,465
Non-cash foreign exchange (gain) loss 160 (657)
Loss on disposal of property, plant and equipment 33 0
Non-cash charge on inventory step up of acquired inventory sold 10,261 0
Amortization of debt issuance costs 485 63
Other 3,130 2,517
Changes in operating assets and liabilities:    
Accounts receivable 2,584 (4,733)
Inventories (7,393) (1,669)
Prepaid expenses and other assets (2,051) (2,190)
Accounts payable 7,819 (2,847)
Accrued expenses, income taxes payable and other liabilities (26,387) (7,298)
Net cash provided by operating activities 13,701 30,618
Cash flows from investing activities:    
Additions to property, plant and equipment (7,847) (4,175)
Acquisition of a business, net of cash acquired (1,182,186) 0
Purchases of available-for-sale securities 0 (50,174)
Proceeds from the sale and maturities of available-for-sale securities 0 1,851
Net cash used in investing activities (1,190,033) (52,498)
Cash flows from financing activities:    
Repayment of long-term debt 0 (3,281)
Repurchases of common stock (4,001) (4,741)
Proceeds from issuance of long-term debt 1,062,337 0
Debt issuance costs (18,745) 0
Proceeds from issuance of stock 3,031 6,464
Dividends paid (10,377) (5,057)
Net cash provided by (used in) financing activities 1,032,245 (6,615)
Effect of exchange rate changes on cash 46 7,835
Decrease in cash and cash equivalents (144,041) (20,660)
Cash and cash equivalents at beginning of period 352,921 397,890
Cash and cash equivalents at end of period 208,880 377,230
Supplemental disclosure of non-cash investing and financing activities:    
Purchases of property, plant and equipment in accrued liabilities and accounts payable at the end of the period 1,558 1,539
Equity consideration related to the acquisition of KMG Chemicals, Inc $ 331,048 $ 0