Adjusted LIBOR rate variable rate term.

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Business combination consideration transferred liabilities outstanding.

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Debt instrument periodic payment date.

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Debt instrument servicing fee.

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Debt, lump sum payment on the maturity date.

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Percentage of compensating balance requirement for bank acceptance drafts.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

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Debt - Additional Information (Details 2) $ in Thousands, ¥ in Millions							1 Months Ended						6 Months Ended	9 Months Ended		12 Months Ended
	Apr. 21, 2015 USD ($)	Apr. 16, 2015 USD ($)	Feb. 25, 2015 JPY (¥)	Feb. 25, 2015 USD ($)	Jan. 02, 2015 USD ($)	Mar. 29, 2013 JPY (¥)	Mar. 31, 2015 USD ($)	Feb. 28, 2015 JPY (¥)	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($)	Nov. 30, 2014 USD ($)	Oct. 31, 2014 USD ($)	Jun. 30, 2015 CNY (¥)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 JPY (¥)	Sep. 30, 2015 CNY (¥)	Sep. 30, 2015 JPY (¥)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Feb. 25, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 CNY (¥)	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Repayment of notes payable														$ 20,072	$ 15,851
Restricted cash and investments																			$ 3,062			$ 21,254
Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity																						20,000
Short-term line of credit facility																			23,800			0
Line Of Credit																			23,800
Line of Credit Facility, Remaining Borrowing Capacity																			30,000
Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Short-term line of credit facility																		¥ 1,400,000,000	12,000
Bank Borrowings [Member]
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance														The Company's original credit agreement with Comerica Bank required the maintenance of specified financial covenants, including a debt to EBITDA ratio and liquidity ratios.
Restricted cash and investments																			$ 0			17,500
Bank Borrowings [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Short-term line of credit facility																						17,500
Interest rate description																borrowings under the term loan bore interest at an interest rate option of a base rate as defined in the agreement plus 2.0% or LIBOR plus 3.0%
Tunable Laser Product Lines From EMCORE Corporation [Member]
Debt Instrument [Line Items]
Issuance of notes to the seller of acquired business		$ 15,500			$ 16,000
Debt Instrument, Term										2 years
Libor Plus Rate [Member] \| Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate														2.75%
Interest rate description														bear interest at an interest rate option of a base rate as defined in the agreement plus 1.75% or LIBOR plus 2.75%. As of September 30, 2015 the rate on the LIBOR option was 2.95%.
Line of credit facility, interest rate																	2.95%	2.95%	2.95%
Libor Plus Rate [Member] \| Bank Borrowings [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate																3.00%
First Year [Member] \| Tunable Laser Product Lines From EMCORE Corporation [Member]
Debt Instrument [Line Items]
Note payable, interest rate										5.00%
Second Year [Member] \| Tunable Laser Product Lines From EMCORE Corporation [Member]
Debt Instrument [Line Items]
Note payable, interest rate										13.00%
Credit Facility Base Rate [Member] \| Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate														1.75%
Credit Facility Base Rate [Member] \| Bank Borrowings [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate																2.00%
First Credit Facility Expires June 2016 [Member] \| China
Debt Instrument [Line Items]
Percentage of compensating balance requirement for bank acceptance drafts													30.00%
Second Credit Facility Expires September 2015 [Member] \| China
Debt Instrument [Line Items]
Credit facility, expiration date														Sep. 30, 2016	Sep. 30, 2016
Percentage of compensating balance requirement for bank acceptance drafts														30.00%	30.00%
First Short-Term Advance Financing Agreement Expires April 2015 [Member] \| China
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity												$ 5,000
Obligation bear interest												4.02%
Due date of the principal												Apr. 30, 2015
Line Of Credit	$ 5,000
Adjusted LIBOR variable rate term	6 months
Debt Instrument, Basis Spread on Variable Rate	3.30%
First Short-Term Advance Financing Agreement Expires April 2015 [Member] \| China \| Libor Plus Rate [Member]
Debt Instrument [Line Items]
Obligation bear variable interest	3.71%
Second Short-Term Advance Financing Agreement Expires May 2015 [Member] \| China
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											$ 5,000
Obligation bear interest											2.33%
Due date of the principal											May 31, 2015
Service fees											1.00%
First Short-Term Advance Financing Agreement Expires October 2015 [Member] \| China
Debt Instrument [Line Items]
Due date of the principal and interest														Oct. 08, 2015
First Short-Term Advance Financing Agreement Expires October 2015 [Member] \| China \| Libor Plus Rate [Member]
Debt Instrument [Line Items]
Debt instrument description of variable rate basis														LIBOR
Term Loan B [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Due date of the principal			Feb. 25, 2025	Feb. 25, 2025
Debt, aggregate principal amount			¥ 1,000,000,000																		$ 8,400
Debt, periodic principal payments \| ¥			8,333,000
Debt, lump sum payment on the maturity date \| ¥			8,373,000
Loan structuring fee including consumption tax			¥ 40,500,000	$ 300
Term Loan B [Member] \| Tunable Laser Product Lines From EMCORE Corporation [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Issuance of notes to the seller of acquired business										$ 15,500
Term Loan B [Member] \| Tokyo Interbank Offer Rate [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.40%	1.40%
Senior Secured Revolving Credit Facility Expires November 2016 [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity										$ 25,000									$ 30,000
Line Of Credit							$ 15,800
Senior Secured Revolving Credit Facility Expires November 2016 [Member] \| Libor Plus Rate [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							2.75%
Senior Secured Revolving Credit Facility Expires November 2016 [Member] \| Credit Facility Base Rate [Member] \| Comerica [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.75%
Senior Secured Revolving Credit Facility Expires November 2016 [Member] \| Federal Funds Effective Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.00%
Senior Secured Revolving Credit Facility Expires November 2016 [Member] \| Daily Adjusting LIBOR Rate [member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate							1.00%
Term Loan A [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Due date of the principal			Feb. 23, 2018	Feb. 23, 2018
Debt, aggregate principal amount			¥ 500,000,000																		$ 4,200
Term Loan A [Member] \| Tokyo Interbank Offer Rate [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.40%	1.40%
Loans Payable \| First Credit Facility Expires June 2016 [Member] \| China
Debt Instrument [Line Items]
Credit facility, expiration date														Jun. 30, 2016
Line of Credit Facility, Maximum Borrowing Capacity													¥ 120.0							$ 18,900
Loans Payable \| Second Credit Facility Expires September 2015 [Member] \| China
Debt Instrument [Line Items]
Short-term line of credit facility																	¥ 133.0		20,900				¥ 133.0	$ 20,900
Notes Payable
Debt Instrument [Line Items]
Notes payable outstanding																¥ 700,000,000						5,800
Restricted cash and investments																			3,062			$ 3,754
Notes Payable \| NeoPhotonics Semiconductor [Member]
Debt Instrument [Line Items]
Obligation bear interest																1.50%						1.50%
Repayment of notes payable								¥ 710,000,000	$ 6,000
Notes Payable \| NeoPhotonics Semiconductor [Member] \| Notes Payable To be paid in three equal installments [Member]
Debt Instrument [Line Items]
Issuance of notes to the seller of acquired business \| ¥						¥ 1,050,000,000
Bankers Acceptance
Debt Instrument [Line Items]
Restricted cash and investments, current																			3,100			$ 3,800
Bankers Acceptance \| China
Debt Instrument [Line Items]
Short-term line of credit facility																			10,200			$ 12,800
Bankers Acceptance \| First Credit Facility Expires June 2016 [Member] \| China
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity													¥ 171.4							$ 26,900
Bankers Acceptance \| Second Credit Facility Expires September 2015 [Member] \| China
Debt Instrument [Line Items]
Short-term line of credit facility																	¥ 190.0		$ 29,900				¥ 190.0	$ 29,900