UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 363,902	$ 287,479
Accounts receivable, less allowance for doubtful accounts of $1,799 at June 30, 2017, and $1,828 at September 30, 2016	66,338	62,830
Inventories	70,759	72,123
Prepaid expenses and other current assets	16,803	14,398
Total current assets	517,802	436,830
Property, plant and equipment, net	106,162	106,496
Goodwill	101,812	100,639
Other intangible assets, net	44,643	50,476
Deferred income taxes	19,528	20,747
Other long-term assets	11,327	12,042
Total assets	801,274	727,230
Current liabilities:
Accounts payable	15,958	16,834
Accrued expenses, income taxes payable and other current liabilities	49,295	41,395
Current portion of long-term debt	9,844	7,656
Total current liabilities	75,097	65,885
Long-term debt, net of current portion, less prepaid debt issuance cost of $504 at June 30, 2017 and $696 at September 30, 2016	137,309	146,961
Deferred income taxes	64	75
Other long-term liabilities	13,782	16,661
Total liabilities	226,252	229,582
Commitments and contingencies (Note 10)
Stockholders' equity:
Common Stock: Authorized: 200,000,000 shares, $0.001 par value; Issued: 35,144,183 shares at June 30, 2017, and 34,261,304 shares at September 30, 2016	35	34
Capital in excess of par value of common stock	573,895	530,840
Retained earnings	376,483	330,776
Accumulated other comprehensive income	4,049	9,556
Treasury stock at cost, 9,835,419 shares at June 30, 2017, and 9,744,642 shares at September 30, 2016	(379,440)	(373,558)
Total stockholders' equity	575,022	497,648
Total liabilities and stockholders' equity	$ 801,274	$ 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.