CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Current assets:
Cash and cash equivalents	$ 278,895	$ 257,354
Accounts receivable, less allowance for doubtful accounts of $643 at December 31, 2020 and $583 at September 30, 2020	139,840	134,023
Inventories	157,355	159,134
Prepaid expenses and other current assets	27,830	26,558
Total current assets	603,920	577,069
Property, plant and equipment, net	365,871	362,067
Goodwill	721,621	718,647
Other intangible assets, net	652,593	670,964
Deferred income taxes	7,984	7,713
Other long-term assets	38,957	40,007
Total assets	2,390,946	2,376,467
Current liabilities:
Accounts payable	49,266	49,254
Current portion of long-term debt	10,650	10,650
Accrued expenses, income taxes payable and other current liabilities	98,874	121,442
Total current liabilities	158,790	181,346
Long-term debt, net of current portion	908,834	910,764
Deferred income taxes	108,175	112,212
Other long-term liabilities	106,419	97,832
Total liabilities	1,282,218	1,302,154
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common Stock Authorized: 200,000 shares, $0.001 par value; Issued: 40,092 shares at December 31, 2020, and 39,914 shares at September 30, 2020	40	40
Capital in excess of par value of common stock	1,030,677	1,019,803
Retained earnings	572,441	553,718
Accumulated other comprehensive income (loss)	5,135	(14,104)
Treasury stock at cost, 10,931 shares at December 31, 2020, and 10,834 shares at September 30, 2020	(499,565)	(485,144)
Total stockholders’ equity	1,108,728	1,074,313
Total liabilities and stockholders’ equity	$ 2,390,946	$ 2,376,467