Adjusted LIBOR rate variable rate term.

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Debt instrument servicing fee.

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Debt, lump sum payment on the maturity date.

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The numbers of letters of credit.

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

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The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

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

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No definition available.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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No definition available.

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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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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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- Definition

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.

+ References

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt - Additional Information (Details) $ in Thousands, ¥ in Millions				1 Months Ended									3 Months Ended	4 Months Ended	9 Months Ended
	Feb. 25, 2015 JPY (¥)	Feb. 25, 2015 USD ($)	Jan. 02, 2015 USD ($)	Oct. 31, 2016 CNY (¥)	Aug. 31, 2016 CNY (¥)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 CNY (¥)	May 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Feb. 28, 2015 JPY (¥)	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($)	Sep. 30, 2016 JPY (¥) item	Apr. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	Dec. 31, 2015 JPY (¥)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 CNY (¥)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Feb. 25, 2015 USD ($)
Debt Instrument [Line Items]
Repayment of notes payable															$ 14,069	$ 20,072
Mitsubishi Bank [Member]
Debt Instrument [Line Items]
Short-term line of credit facility													¥ 1,300,000,000					$ 13,300		¥ 1,400,000,000	$ 11,500
Unamortized debt issuance costs													¥ 23,700,000					200		¥ 30,100,000	300
Tunable Laser Product Lines From EMCORE Corporation [Member]
Debt Instrument [Line Items]
Issuance of notes to the seller of acquired business			$ 16,000											$ 15,482
Debt Instrument, Term												2 years
Libor Plus Rate [Member] \| Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Short-term line of credit facility																		$ 23,800			23,800
Debt Instrument, Basis Spread on Variable Rate															2.75%
Line of credit facility, interest rate													3.28%					3.28%
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%
Federal Funds Effective Rate [Member] \| Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate															1.00%
Daily Adjusting LIBOR Rate [member] \| Comerica [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate															1.00%
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 2016 [Member] \| China]
Debt Instrument [Line Items]
Percentage of compensating balance requirement for bank acceptance drafts						30.00%
First Short-Term Advance Financing Agreement Expires April 2015 [Member]
Debt Instrument [Line Items]
Debt repaid									$ 5,000
Interest rate									4.02%					4.02%
First Short-Term Advance Financing Agreement Expires April 2015 [Member] \| China]
Debt Instrument [Line Items]
Debt repaid						$ 5,000
First Short-Term Advance Financing Agreement Expires April 2015 [Member] \| China] \| Libor Plus Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						3.30%
Obligation bear variable interest																						3.71%	3.71%
Second Short-Term Advance Financing Agreement Expires May 2015 [Member]
Debt Instrument [Line Items]
Debt repaid								$ 5,000
Interest rate								2.33%
Service fees interest percentage								1.00%
Term Loan B [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
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																									$ 30,000
Term Loan A [Member] \| Mitsubishi Bank [Member]
Debt Instrument [Line Items]
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%
Capital Expenditures Credit Facility Expires January 31, 2017 Member \| Comerica [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases																		$ 62,000
Loans Payable \| First Credit Facility Expires June 2016 [Member] \| China]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							¥ 120.0																	$ 18,000
Loans Payable \| Second Credit Facility Expires September 2016 [Member] \| China]
Debt Instrument [Line Items]
Short-term line of credit facility																						¥ 133.0	$ 19,900
Notes Payable [Member] \| NeoPhotonics Semiconductor [Member]
Debt Instrument [Line Items]
Repayment of notes payable										¥ 710,000,000	$ 6,000
Bankers Acceptance
Debt Instrument [Line Items]
Restricted cash and investments, current																		2,800			2,700
Bankers Acceptance \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term															3 months
Bankers Acceptance \| China]
Debt Instrument [Line Items]
Short-term line of credit facility																		7,700			$ 8,900
Bankers Acceptance \| China] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term															6 months
Bankers Acceptance \| First Credit Facility Expires June 2016 [Member] \| China]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							¥ 171.4																	$ 25,800
Bankers Acceptance \| Second Credit Facility Expires September 2016 [Member] \| China]
Debt Instrument [Line Items]
Short-term line of credit facility																						¥ 190.0	$ 28,500
Bankers Acceptance \| Third Credit Facility Expires July 2019 [Member] \| China]
Debt Instrument [Line Items]
Percentage of compensating balance requirement for bank acceptance drafts					30.00%
Bank Borrowings [Member]
Debt Instrument [Line Items]
Percentage of compensating balance requirement for bank acceptance drafts													30.00%
Number of letters of credit \| item													2
Short-term line of credit facility																		$ 1,300
China \| First Short-Term Advance Financing Agreement Expires April 2015 [Member] \| Libor Plus Rate [Member]
Debt Instrument [Line Items]
Adjusted LIBOR variable rate term						6 months
China \| Loans Payable \| Third Credit Facility Expires July 2019 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					¥ 30.0														$ 4,500
China \| Bank Overdrafts \| Third Credit Facility Expires July 2019 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					¥ 42.9														$ 6,400
Subsequent Event [Member] \| Loans Payable \| Third Credit Facility Expires September 2017 [Member] \| China]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				¥ 266.0													$ 39,900
Percentage of compensating balance requirement for bank acceptance drafts				30.00%
Subsequent Event [Member] \| Bankers Acceptance \| Third Credit Facility Expires September 2017 [Member] \| China]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				¥ 380.0													$ 57,000