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Consolidated Statements of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2009 | $ 229,586 | $ 284 | $ (28,161) | $ 181,282 | $ 82,708 | $ (6,527)
Beginning balance (in shares) at Sep. 30, 2009 |  | 28,409 | 3,708 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 8,941 |  |  |  | 8,941 |
Foreign currency translation adjustment | (3,074) |  |  |  |  | (3,074)
Net unrealized (loss) gain on investments | 34 |  |  |  |  | 34
Reclassification of (gain) loss into net income | (22) |  |  |  |  | (22)
Total comprehensive income | 5,879 |  |  |  |  |
Employee stock purchase issuances | 894 |  | 943 | (49) |  |
Employee stock purchase issuances (in shares) |  |  | (124) |  |  |
Issuance of stock upon exercise of stock options | 1,672 | 3 |  | 1,669 |  |
Issuance of stock upon exercise of stock options (in shares) |  | 257 |  |  |  |
Tax benefit realized upon exercise of stock options | (846) |  |  | (846) |  |
Stock-based compensation expense | 3,371 |  |  | 3,371 |  |
Ending balance at Sep. 30, 2010 | 240,556 | 287 | (27,218) | 185,427 | 91,649 | (9,589)
Ending balance (in shares) at Sep. 30, 2010 |  | 28,666 | 3,584 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 11,019 |  |  |  | 11,019 |
Foreign currency translation adjustment | (770) |  |  |  |  | (770)
Net unrealized (loss) gain on investments | (104) |  |  |  |  | (104)
Reclassification of (gain) loss into net income | 6 |  |  |  |  | 6
Total comprehensive income | 10,151 |  |  |  |  |
Employee stock purchase issuances | 990 |  | 852 | 138 |  |
Employee stock purchase issuances (in shares) |  |  | (112) |  |  |
Issuance of stock upon exercise of stock options | 2,853 | 4 |  | 2,849 |  |
Issuance of stock upon exercise of stock options (in shares) |  | 435 |  |  |  |
Tax benefit realized upon exercise of stock options | 2,722 |  |  | 2,722 |  |
Stock-based compensation expense | 3,444 |  |  | 3,444 |  |
Ending balance at Sep. 30, 2011 | 260,716 | 291 | (26,366) | 194,580 | 102,668 | (10,457)
Ending balance (in shares) at Sep. 30, 2011 |  | 29,101 | 3,472 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 7,615 |  |  |  | 7,615 |
Foreign currency translation adjustment | (3,354) |  |  |  |  | (3,354)
Net unrealized (loss) gain on investments | 75 |  |  |  |  | 75
Reclassification of (gain) loss into net income | 11 |  |  |  |  | 11
Total comprehensive income | 4,347 |  |  |  |  |
Employee stock purchase issuances | 1,041 |  | 877 | 164 |  |
Employee stock purchase issuances (in shares) |  |  | (116) |  |  |
Issuance of stock upon exercise of stock options | 1,072 | 2 |  | 1,070 |  |
Issuance of stock upon exercise of stock options (in shares) |  | 168 |  |  |  |
Tax benefit realized upon exercise of stock options | (46) |  |  | (46) |  |
Stock-based compensation expense | 3,727 |  |  | 3,727 |  |
Ending balance at Sep. 30, 2012 | $ 270,857 | $ 293 | $ (25,489) | $ 199,495 | $ 110,283 | $ (13,725)
Ending balance (in shares) at Sep. 30, 2012 |  | 29,269 | 3,356 |  |  |

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- Definition The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 30 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e557-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A + Details
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- Definition Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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