UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 305,714	$ 287,479
Accounts receivable, less allowance for doubtful accounts of $1,748 at December 31, 2016, and $1,828 at September 30, 2016	66,828	62,830
Inventories	71,088	72,123
Prepaid expenses and other current assets	13,679	14,398
Total current assets	457,309	436,830
Property, plant and equipment, net	102,999	106,496
Goodwill	99,404	100,639
Other intangible assets, net	48,433	50,476
Deferred income taxes	20,925	20,747
Other long-term assets	11,928	12,042
Total assets	740,998	727,230
Current liabilities:
Accounts payable	19,575	16,834
Accrued expenses, income taxes payable and other current liabilities	39,385	41,395
Current portion of long-term debt	10,938	7,656
Total current liabilities	69,898	65,885
Long-term debt, net of current portion, less prepaid debt issuance cost of $630 at December 31, 2016 and $696 at September 30, 2016	143,745	146,961
Deferred income taxes	61	75
Other long-term liabilities	13,939	16,661
Total liabilities	227,643	229,582
Commitments and contingencies (Note 10)
Stockholders' equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 34,693,661 shares at December 31, 2016, and 34,261,304 shares at September 30, 2016	35	34
Capital in excess of par value of common stock	548,757	530,840
Retained earnings	348,475	330,776
Accumulated other comprehensive income (loss)	(7,352)	9,556
Treasury stock at cost, 9,795,202 shares at December 31, 2016, and 9,744,642 shares at September 30, 2016	(376,560)	(373,558)
Total stockholders' equity	513,355	497,648
Total liabilities and stockholders' equity	$ 740,998	$ 727,230

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.