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Borrowings (Details)
12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Dec. 31, 2014
Land use rights
USD ($)
Dec. 31, 2014
Land use rights
CNY
Dec. 31, 2013
Land use rights
CNY
Dec. 31, 2014
Certain buildings
USD ($)
Dec. 31, 2014
Certain buildings
CNY
Dec. 31, 2013
Certain buildings
CNY
Dec. 31, 2014
Certain equipment
USD ($)
Dec. 31, 2014
Certain equipment
CNY
Dec. 31, 2013
Certain equipment
CNY
Dec. 31, 2014
Xingye International Trust Co., Ltd
USD ($)
Dec. 31, 2014
Xingye International Trust Co., Ltd
CNY
Dec. 31, 2014
Bank notes
USD ($)
Dec. 31, 2014
Bank notes
CNY
Dec. 31, 2013
Bank notes
CNY
Dec. 31, 2012
Bank notes
CNY
Dec. 31, 2014
Industrial & Commercial Bank Of China
USD ($)
loan
Dec. 31, 2014
Industrial & Commercial Bank Of China
CNY
loan
Dec. 31, 2013
Industrial & Commercial Bank Of China
CNY
loan
Dec. 31, 2014
Industrial & Commercial Bank Of China
Note payable to bank due October 12, 2016
USD ($)
Dec. 31, 2014
Industrial & Commercial Bank Of China
Note payable to bank due October 12, 2016
CNY
Dec. 31, 2013
Industrial & Commercial Bank Of China
Note payable to bank due October 12, 2016
CNY
Dec. 31, 2013
Industrial & Commercial Bank Of China
Note payable to bank, repaid on September 9, 2014
CNY
Dec. 31, 2014
Agricultural Bank Of China
USD ($)
loan
Dec. 31, 2014
Agricultural Bank Of China
CNY
loan
Dec. 31, 2013
Agricultural Bank Of China
CNY
loan
Dec. 31, 2014
Agricultural Bank Of China
Six notes payable to bank
USD ($)
loan
Dec. 31, 2014
Agricultural Bank Of China
Six notes payable to bank
CNY
loan
Nov. 16, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
USD ($)
item
Nov. 16, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
CNY
Nov. 05, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
USD ($)
Nov. 05, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
CNY
Oct. 16, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
USD ($)
Oct. 16, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
CNY
Oct. 15, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
USD ($)
Oct. 15, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
CNY
Aug. 05, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
USD ($)
Aug. 05, 2015
Agricultural Bank Of China
Six notes payable to bank
Forecast
CNY
Dec. 31, 2014
Agricultural Bank Of China
Note payable to bank, expected to be repaid October 7, 2015
USD ($)
Dec. 31, 2014
Agricultural Bank Of China
Note payable to bank, expected to be repaid October 7, 2015
CNY
Feb. 05, 2014
Agricultural Bank Of China
Two notes payable to bank
CNY
Jan. 15, 2014
Agricultural Bank Of China
Two notes payable to bank
CNY
Dec. 31, 2013
Agricultural Bank Of China
Two notes payable to bank
CNY
loan
Sep. 15, 2014
Agricultural Bank Of China
Two notes payable to bank, second
CNY
Mar. 04, 2014
Agricultural Bank Of China
Two notes payable to bank, second
CNY
Dec. 31, 2013
Agricultural Bank Of China
Two notes payable to bank, second
CNY
loan
Dec. 31, 2013
Longjiang Bank
CNY
loan
Dec. 23, 2013
Longjiang Bank
Line of credit, repaid on December 18, 2014
CNY
Dec. 19, 2013
Longjiang Bank
Line of credit, repaid on December 18, 2014
CNY
Dec. 31, 2013
Longjiang Bank
Line of credit, repaid on December 18, 2014
CNY
Dec. 31, 2014
China Construction Bank
USD ($)
loan
Dec. 31, 2014
China Construction Bank
CNY
loan
Dec. 31, 2013
China Construction Bank
CNY
loan
Dec. 31, 2014
China Construction Bank
Three notes payable to bank
USD ($)
loan
item
Dec. 31, 2014
China Construction Bank
Three notes payable to bank
CNY
loan
Mar. 19, 2015
China Construction Bank
Three notes payable to bank
Forecast
USD ($)
Mar. 19, 2015
China Construction Bank
Three notes payable to bank
Forecast
CNY
Jan. 19, 2015
China Construction Bank
Three notes payable to bank
Forecast
USD ($)
Jan. 19, 2015
China Construction Bank
Three notes payable to bank
Forecast
CNY
Jan. 06, 2015
China Construction Bank
Three notes payable to bank
Forecast
USD ($)
Jan. 06, 2015
China Construction Bank
Three notes payable to bank
Forecast
CNY
Dec. 31, 2014
China Construction Bank
Three notes payable to bank
Daqing Borun
Minimum
Dec. 31, 2014
China Construction Bank
Three notes payable to bank
Daqing Borun
Maximum
USD ($)
Dec. 31, 2014
China Construction Bank
Three notes payable to bank
Daqing Borun
Maximum
CNY
Dec. 31, 2014
China Construction Bank
Note Payable To Bank Expected To Be Repaid September 28, 2015
USD ($)
item
Dec. 31, 2014
China Construction Bank
Note Payable To Bank Expected To Be Repaid September 28, 2015
CNY
Dec. 31, 2014
China Construction Bank
Note Payable To Bank Expected To Be Repaid September 28, 2015
Daqing Borun
Minimum
Dec. 31, 2014
China Construction Bank
Note Payable To Bank Expected To Be Repaid September 28, 2015
Daqing Borun
Maximum
USD ($)
Dec. 31, 2014
China Construction Bank
Note Payable To Bank Expected To Be Repaid September 28, 2015
Daqing Borun
Maximum
CNY
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
USD ($)
item
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
CNY
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Minimum
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Maximum
USD ($)
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Maximum
CNY
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Certain buildings
USD ($)
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Certain buildings
CNY
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Land
USD ($)
Dec. 31, 2014
China Construction Bank
Note payable to bank, expected to be repaid December 11, 2015
Daqing Borun
Land
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on March 6, 2014
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on March 6, 2014
Daqing Borun
Maximum
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on September 16, 2014
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on September 16, 2014
Minimum
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on September 16, 2014
Daqing Borun
Maximum
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on October 24, 2014
CNY
item
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on October 24, 2014
Daqing Borun
Minimum
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on October 24, 2014
Daqing Borun
Maximum
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on October 24, 2014
Daqing Borun
Certain buildings
CNY
Dec. 31, 2013
China Construction Bank
Note payable to bank, repaid on October 24, 2014
Daqing Borun
Land
CNY
Dec. 31, 2014
Agricultural Development Bank of China
USD ($)
loan
Dec. 31, 2014
Agricultural Development Bank of China
CNY
loan
Dec. 31, 2013
Agricultural Development Bank of China
CNY
loan
Nov. 11, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
USD ($)
item
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
CNY
Nov. 30, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
CNY
Nov. 10, 2016
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Forecast
USD ($)
Nov. 10, 2016
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Forecast
CNY
Oct. 20, 2016
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Forecast
USD ($)
Oct. 20, 2016
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Forecast
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Property, plant and equipment
USD ($)
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable to bank due November 10, 2016
Property, plant and equipment
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
USD ($)
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
CNY
Sep. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
USD ($)
Sep. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
CNY
Aug. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
USD ($)
Aug. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
CNY
Jun. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
USD ($)
Jun. 30, 2015
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Forecast
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Daqing Borun
Maximum
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Corn Inventory
Daqing Borun
USD ($)
T
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 190,000,000
Corn Inventory
Daqing Borun
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
USD ($)
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
Daqing Borun
Maximum
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
Daqing Borun
Certain equipment
USD ($)
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
Daqing Borun
Certain equipment
CNY
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
Corn Inventory
Daqing Borun
USD ($)
T
Dec. 31, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid September 30, 2015, Face amount of RMB 10,000,000
Corn Inventory
Daqing Borun
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
Daqing Borun
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
Daqing Borun
Land use rights
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
Daqing Borun
Certain buildings
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
Daqing Borun
Property, plant and equipment
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on November 11, 2014
Daqing Borun
Certain equipment
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on September 30, 2014
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note payable to bank, repaid on September 30, 2014
Daqing Borun
Certain equipment
CNY
Dec. 02, 2013
Agricultural Development Bank of China
Line of credit, repaid on September 30, 2014
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Line of credit, repaid on September 30, 2014
CNY
Mar. 21, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
USD ($)
Mar. 21, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
CNY
Feb. 28, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
USD ($)
Feb. 28, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
CNY
Jan. 07, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
USD ($)
Jan. 07, 2014
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
CNY
Dec. 31, 2013
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
USD ($)
Dec. 31, 2013
Agricultural Development Bank of China
Note Payable To Bank Expected To Be Repaid December 31, 2014, Face amount of RMB 150,000,000
CNY
Dec. 31, 2014
China CITIC Bank
USD ($)
loan
Dec. 31, 2014
China CITIC Bank
CNY
loan
Dec. 31, 2013
China CITIC Bank
CNY
loan
Dec. 31, 2014
China CITIC Bank
Xingye International Trust Co., Ltd
USD ($)
Dec. 31, 2014
China CITIC Bank
Xingye International Trust Co., Ltd
CNY
Sep. 04, 2014
China CITIC Bank
Two notes payable to bank
CNY
Aug. 18, 2014
China CITIC Bank
Two notes payable to bank
CNY
Dec. 31, 2013
China CITIC Bank
Two notes payable to bank
CNY
loan
Dec. 31, 2014
China CITIC Bank
Three notes payable to bank
USD ($)
loan
Dec. 31, 2014
China CITIC Bank
Three notes payable to bank
CNY
loan
Sep. 28, 2015
China CITIC Bank
Three notes payable to bank
Forecast
USD ($)
Sep. 28, 2015
China CITIC Bank
Three notes payable to bank
Forecast
CNY
Aug. 04, 2015
China CITIC Bank
Three notes payable to bank
Forecast
USD ($)
Aug. 04, 2015
China CITIC Bank
Three notes payable to bank
Forecast
CNY
Jun. 24, 2015
China CITIC Bank
Three notes payable to bank
Forecast
USD ($)
Jun. 24, 2015
China CITIC Bank
Three notes payable to bank
Forecast
CNY
Dec. 31, 2014
China CITIC Bank
Note Payable To Bank Expected To Be Repaid October 29, 2015
USD ($)
Dec. 31, 2014
China CITIC Bank
Note Payable To Bank Expected To Be Repaid October 29, 2015
CNY
Dec. 31, 2014
China CITIC Bank
Note Payable To Bank Expected To Be Repaid February 11, 2015
USD ($)
Dec. 31, 2014
China CITIC Bank
Note Payable To Bank Expected To Be Repaid February 11, 2015
CNY
Dec. 31, 2013
China CITIC Bank
Note payable to bank, repaid on April 27, 2014
CNY
Dec. 31, 2013
China CITIC Bank
Note payable to bank, repaid on June 16, 2014
CNY
Dec. 31, 2014
Bank of China
USD ($)
loan
Dec. 31, 2014
Bank of China
CNY
loan
Dec. 31, 2013
Bank of China
CNY
loan
Jun. 15, 2015
Bank of China
Forecast
USD ($)
Jun. 15, 2015
Bank of China
Forecast
CNY
May 07, 2015
Bank of China
Forecast
USD ($)
May 07, 2015
Bank of China
Forecast
CNY
May 13, 2013
Bank of China
Two notes payable to bank
CNY
Dec. 31, 2014
Bank of China
Two notes payable to bank
USD ($)
loan
Dec. 31, 2014
Bank of China
Two notes payable to bank
CNY
loan
Dec. 31, 2013
Bank of China
Two notes payable to bank
CNY
loan
Dec. 31, 2014
Bank of China
Three notes payable to bank
USD ($)
loan
Dec. 31, 2014
Bank of China
Three notes payable to bank
CNY
loan
Borrowings                                                                                                                                                                                                                                                                                                                                                              
Short-term borrowings $ 147,246,282us-gaap_ShortTermBorrowings 901,000,000us-gaap_ShortTermBorrowings 620,200,000us-gaap_ShortTermBorrowings                     $ 4,249,060us-gaap_ShortTermBorrowings
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
26,000,000us-gaap_ShortTermBorrowings
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
                    50,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember92014Member
      $ 24,513,809us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
150,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
                    $ 6,537,016us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober72015Member
40,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober72015Member
    43,200,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
    60,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankSecondMember
              $ 35,953,588us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
220,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
                  $ 4,902,762us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
30,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      $ 8,171,269us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
50,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
              70,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnMarch62014Member
  30,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember162014Member
    50,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnOctober242014Member
                                  $ 31,050,825us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb190000000Member
190,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb190000000Member
                  $ 1,634,254us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb10000000Member
10,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb10000000Member
          50,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnNovember112014Member
          10,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember302014Member
                                    100,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
$ 16,179,114us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
99,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
            $ 5,066,187us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober292015Member
31,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober292015Member
$ 6,537,016us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidFebruary112015Member
40,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidFebruary112015Member
30,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnApril272014Member
40,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnJune162014Member
                $ 2,451,381us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
15,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
22,000,000us-gaap_ShortTermBorrowings
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
   
Long-term borrowings                                                                                                                                                                                                                                                                                                                                                              
Current portion 3,922,210us-gaap_LoansPayableToBankCurrent 24,000,000us-gaap_LoansPayableToBankCurrent 24,000,000us-gaap_LoansPayableToBankCurrent                                                                                                                                                                                                                                                                                                                                                        
Non-current portion 13,727,733us-gaap_LongTermLoansFromBank 84,000,000us-gaap_LongTermLoansFromBank 48,000,000us-gaap_LongTermLoansFromBank                                                                                                                                                                                                                                                                                                                                                        
Total borrowings 164,896,225born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount 1,009,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount 692,200,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount                     4,249,060born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
26,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
        7,844,420born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
48,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
122,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
        31,050,825born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
190,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
103,200,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
                                        25,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_LongjiangCommercialBankMember
      49,027,619born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
300,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
150,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
                                                                      42,490,603born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
260,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
100,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
                                                                                            27,782,317born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
170,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
170,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
                                      2,451,381born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
15,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
22,000,000born_LongTermDebtExcludingBondsPayableAndShortTermCombinedAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
                   
Interest rate (as a percent)                           5.23%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
5.23%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
                                                                          8.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_LongjiangCommercialBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_LineOfCreditRepaidOnDecember182014Member
                                                        6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnMarch62014Member
                          6.33%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_LongtermDebtTypeAxis
= born_NotePayableToBankDueNovember102016Member
6.33%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_LongtermDebtTypeAxis
= born_NotePayableToBankDueNovember102016Member
              6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb190000000Member
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb190000000Member
                  6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb10000000Member
6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb10000000Member
          6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnNovember112014Member
                                                                  6.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober292015Member
6.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober292015Member
                                 
Number of loans repaid                                                               2born_DebtInstrumentNumberOfLoansRepaid
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
2born_DebtInstrumentNumberOfLoansRepaid
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
                                                                                                                                                                                                                                                                                           
Number of loans granted by lender                                       1born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
1born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
        7born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
7born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
4born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
6born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
6born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
                            2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
    2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankSecondMember
1born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_LongjiangCommercialBankMember
      5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
                                                                  4born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
4born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
                                                                                            5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
4born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
        2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
                        5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
5born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
          2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
2born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
3born_DebtInstrumentNumberOfLoansGrantedByBankLender
/ us-gaap_LineOfCreditFacilityAxis
= born_BankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
Face amount                           4,249,060us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
26,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= born_XingyeInternationalTrustCoLtdMember
        7,844,420us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
48,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
140,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
14,708,286us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
/ us-gaap_LongtermDebtTypeAxis
= born_NotePayableToBankDueOctober122016Member
90,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
/ us-gaap_LongtermDebtTypeAxis
= born_NotePayableToBankDueOctober122016Member
90,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
/ us-gaap_LongtermDebtTypeAxis
= born_NotePayableToBankDueOctober122016Member
50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_IndustrialAndCommercialBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember92014Member
31,050,825us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
190,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
103,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
24,513,809us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
150,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_SixNotesPayableToBankMember
                    6,537,016us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober72015Member
40,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidOctober72015Member
    43,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankMember
    60,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
= born_TwoNotesPayableToBankSecondMember
25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_LongjiangCommercialBankMember
    25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_LongjiangCommercialBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_LineOfCreditRepaidOnDecember182014Member
49,027,619us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
150,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
35,953,588us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
220,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
                  4,902,762us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
30,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      8,171,269us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
              70,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnMarch62014Member
  30,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember162014Member
    50,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnOctober242014Member
        67,004,412us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
410,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
100,000,000us-gaap_DebtInstrumentFaceAmount
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                  6.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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      6.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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6.60%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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                  7.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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    7.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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                                                                                  6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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    6.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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                              7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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                    7.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage
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= born_ChinaCITICBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnApril272014Member
                           
Borrowing capacity                                                                                                         50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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                                                                                        70,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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                                                                  190,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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            190,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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= born_AgriculturalDevelopmentBankOfChinaMember
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= born_NotePayableToBankExpectedToBeRepaidDecember312014FaceAmountRmb150000000Member
                                                                       
Draw down on line of credit                                                                                                     10,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
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15,000,000us-gaap_ProceedsFromLinesOfCredit
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/ us-gaap_ShortTermDebtTypeAxis
= born_LineOfCreditRepaidOnDecember182014Member
                                                                                    60,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
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= born_NotePayableToBankDueNovember102016Member
                                                                      40,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_ShortTermDebtTypeAxis
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  8,171,270us-gaap_ProceedsFromLinesOfCredit
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50,000,000us-gaap_ProceedsFromLinesOfCredit
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8,171,270us-gaap_ProceedsFromLinesOfCredit
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50,000,000us-gaap_ProceedsFromLinesOfCredit
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8,171,270us-gaap_ProceedsFromLinesOfCredit
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50,000,000us-gaap_ProceedsFromLinesOfCredit
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= born_NotePayableToBankExpectedToBeRepaidDecember312014FaceAmountRmb150000000Member
                                                                         
Available borrowing capacity                                                                                                         25,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
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                                                                                                                                                            150,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
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= born_LineOfCreditRepaidOnSeptember302014Member
                                                                                     
Number of family members of CEO who guaranteed debt instrument                                                                                                                 3born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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3born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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= born_ThreeNotesPayableToBankMember
                  2born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
2born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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= born_ChinaConstructionBankMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      3born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
3born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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/ us-gaap_ShortTermDebtTypeAxis
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                        3born_DebtInstrumentGuaranteedByNumberOfFamilyMembersOfCEO
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Debt-to-asset ratio (as a percent)                                                                                                                                   70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_ChinaConstructionBankMember
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70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
      70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
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70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
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= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= born_ChinaConstructionBankMember
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= us-gaap_MaximumMember
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= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
          70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= born_ChinaConstructionBankMember
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= us-gaap_MaximumMember
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= born_NotePayableToBankRepaidOnMarch62014Member
    70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_ChinaConstructionBankMember
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= us-gaap_MaximumMember
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    70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_ChinaConstructionBankMember
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= born_NotePayableToBankRepaidOnOctober242014Member
                                              70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= us-gaap_MaximumMember
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= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb190000000Member
        70.00%born_DebtInstrumentCovenantsDebtToAssetRatio
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= born_DaqingBorunMember
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= born_AgriculturalDevelopmentBankOfChinaMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= born_NotePayableToBankExpectedToBeRepaidSeptember302015FaceAmountRmb10000000Member
                                                                                                                 
Current ratio                                                                                                                                 0.85born_DebtInstrumentCovenantsCurrentRatio
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/ us-gaap_RangeAxis
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        0.80born_DebtInstrumentCovenantsCurrentRatio
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        0.80born_DebtInstrumentCovenantsCurrentRatio
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              1.0born_DebtInstrumentCovenantsCurrentRatio
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        0.85born_DebtInstrumentCovenantsCurrentRatio
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Contingent liabilities                                                                                                                                   45,587,514born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
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278,950,000born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
      25,494,362born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
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156,000,000born_DebtInstrumentCovenantsContingentLiabilities
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/ us-gaap_RangeAxis
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      25,494,362born_DebtInstrumentCovenantsContingentLiabilities
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156,000,000born_DebtInstrumentCovenantsContingentLiabilities
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/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
          368,500,000born_DebtInstrumentCovenantsContingentLiabilities
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= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnMarch62014Member
  0.85born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ShortTermDebtTypeAxis
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279,000,000born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
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    2,790,000,000born_DebtInstrumentCovenantsContingentLiabilities
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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= born_NotePayableToBankRepaidOnOctober242014Member
                                                                                                                                                                           
Contingent liabilities as a percentage of net assets                                                                                                                                   50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
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= us-gaap_MaximumMember
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= born_ThreeNotesPayableToBankMember
50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
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= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
      50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
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= us-gaap_MaximumMember
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= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
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= born_DaqingBorunMember
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= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
          70.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnMarch62014Member
    50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember162014Member
    50.00%born_DebtInstrumentCovenantsContingentLiabilitiesAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnOctober242014Member
                                                                                                                                                                           
Accumulated long-term investment as a percentage of net assets                                                                                                                                   30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_ThreeNotesPayableToBankMember
      30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidSeptember282015Member
      30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankExpectedToBeRepaidDecember112015Member
                30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnSeptember162014Member
    30.00%born_DebtInstrumentCovenantsAccumulatedLongTermInvestmentAsPercentageOfNetAssets
/ dei_LegalEntityAxis
= born_DaqingBorunMember
/ us-gaap_LineOfCreditFacilityAxis
= born_ChinaConstructionBankMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ShortTermDebtTypeAxis
= born_NotePayableToBankRepaidOnOctober242014Member
                                                                                                                                                                           
Weighted average interest rate (as a percent)                               6.43%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
6.43%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
6.63%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
6.53%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
                                                                                                                                                                                                                                                                                                                       
Interest expenses on the bank loans                               $ 9,214,736us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
56,384,972us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
51,336,899us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember
42,767,789us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_NotesPayableToBanksMember