Debt	3 Months Ended
Dec. 30, 2016
Debt Disclosure [Abstract]
Debt	Note 8 – Debt U.S. Credit Facility On April 9, 2015, the Company amended its secured credit facility to extend the maturity to April 9, 2020, increase the amount available for borrowing under the secured revolving credit facility to $500 million, and provide for a delayed-draw term loan facility of $250 million. The Company recorded $2.3 million in debt issuance costs. The credit facility is secured by substantially all the Company’s assets, and interest is based on standard inter-bank offering rates. The interest rate ranges from LIBOR plus 1.25% to LIBOR plus 2.00% depending on leverage ratios at the time the funds are drawn. The Company had $150.0 million outstanding under the secured credit facility at an interest rate of LIBOR plus 1.75%. At December 30, 2016, the weighted average interest rate was 2.47%. U.S. Term Loan, due April 2020 On August 3, 2015, the Company borrowed $250 million under the U.S. Term Loan, due 2020, provided for under the amended secured credit facility (U.S. Term Loan, due 2020). The interest rate on the U.S. Term Loan, due 2020, ranges from LIBOR plus 1.25% to LIBOR plus 2.00%. At December 30, 2016, the interest rate was LIBOR plus 1.75%, which equaled 2.36%. The loan amortizes at 1.25% of the original principal balance quarterly through March 2020, with the remaining balance due in April 2020. 3.625% Senior Notes, due April 2023 In April 2015, the Company issued €330.0 million in 3.625% Notes, due 2023 requiring semi-annual interest payments in April and October of each year until maturity. The net proceeds from the sale of the notes, after deducting $5.9 million of debt issuance costs, were $350.8 million. The 2023 Notes are general unsecured senior obligations of the Company. The 2023 Notes are unconditionally guaranteed on a senior basis by the Company and certain subsidiaries of the Company that are guarantors under the Company’s existing secured credit facility. The 2023 Notes are subject to redemption at the option of the Company at any time prior to April 15, 2018, at a price equal to 100% of the principal amount, plus any accrued interest to the date of redemption and a make-whole provision. The Company may also redeem up to 35% of the 2023 Notes before April 15, 2018, with the net cash proceeds from equity offerings. The 2023 Notes are also subject to redemption at the option of the Company, in whole or in part, on or after April 15, 2018, at redemption prices starting at 102.719% of the principal amount plus accrued interest during the period beginning April 15, 2018, and declining annually to 100% of principal and accrued interest on or after April 15, 2021. Based on quoted market prices, the fair value of the Company’s 2023 Notes was $354.0 million and $365.3 million as of December 30, 2016, and September 30, 2016, respectively. The carrying amount of the secured credit facility and the U.S. Term Loan, due 2020, approximate fair value. The estimate of fair value for the 2023 Notes is based on Level 2 inputs as defined in the fair value hierarchy described in Note 5. Government Refundable Advances Government refundable advances consist of payments received from the Canadian government to assist in research and development related to commercial aviation. The requirement to repay this advance is solely based on year-over-year commercial aviation revenue growth at CMC beginning in 2014. Imputed interest on the advance was 2.9% at December 30, 2016. The debt recognized was $44.3 million and $45.0 million as of December 30, 2016, and September 30, 2016, respectively. Obligation Under Capital Lease The Company leases building and equipment under capital leases. The present value of the minimum capital lease payments, net of the current portion, totaled $66.0 million and $66.2 million as of December 30, 2016, and September 30, 2016, respectively.

Note 8 – Debt

U.S. Credit Facility

On April 9, 2015, the Company amended its secured credit facility to extend the maturity to April 9, 2020, increase the amount available for borrowing under the secured revolving credit facility to $500 million, and provide for a delayed-draw term loan facility of $250 million. The Company recorded $2.3 million in debt issuance costs. The credit facility is secured by substantially all the Company’s assets, and interest is based on standard inter-bank offering rates. The interest rate ranges from LIBOR plus 1.25% to LIBOR plus 2.00% depending on leverage ratios at the time the funds are drawn. The Company had $150.0 million outstanding under the secured credit facility at an interest rate of LIBOR plus 1.75%. At December 30, 2016, the weighted average interest rate was 2.47%.

U.S. Term Loan, due April 2020

On August 3, 2015, the Company borrowed $250 million under the U.S. Term Loan, due 2020, provided for under the amended secured credit facility (U.S. Term Loan, due 2020). The interest rate on the U.S. Term Loan, due 2020, ranges from LIBOR plus 1.25% to LIBOR plus 2.00%. At December 30, 2016, the interest rate was LIBOR plus 1.75%, which equaled 2.36%. The loan amortizes at 1.25% of the original principal balance quarterly through March 2020, with the remaining balance due in April 2020.

3.625% Senior Notes, due April 2023

In April 2015, the Company issued €330.0 million in 3.625% Notes, due 2023 requiring semi-annual interest payments in April and October of each year until maturity. The net proceeds from the sale of the notes, after deducting $5.9 million of debt issuance costs, were $350.8 million. The 2023 Notes are general unsecured senior obligations of the Company. The 2023 Notes are unconditionally guaranteed on a senior basis by the Company and certain subsidiaries of the Company that are guarantors under the Company’s existing secured credit facility. The 2023 Notes are subject to redemption at the option of the Company at any time prior to April 15, 2018, at a price equal to 100% of the principal amount, plus any accrued interest to the date of redemption and a make-whole provision. The Company may also redeem up to 35% of the 2023 Notes before April 15, 2018, with the net cash proceeds from equity offerings. The 2023 Notes are also subject to redemption at the option of the Company, in whole or in part, on or after April 15, 2018, at redemption prices starting at 102.719% of the principal amount plus accrued interest during the period beginning April 15, 2018, and declining annually to 100% of principal and accrued interest on or after April 15, 2021.

Based on quoted market prices, the fair value of the Company’s 2023 Notes was $354.0 million and $365.3 million as of December 30, 2016, and September 30, 2016, respectively. The carrying amount of the secured credit facility and the U.S. Term Loan, due 2020, approximate fair value. The estimate of fair value for the 2023 Notes is based on Level 2 inputs as defined in the fair value hierarchy described in Note 5.

Government Refundable Advances

Government refundable advances consist of payments received from the Canadian government to assist in research and development related to commercial aviation. The requirement to repay this advance is solely based on year-over-year commercial aviation revenue growth at CMC beginning in 2014. Imputed interest on the advance was 2.9% at December 30, 2016. The debt recognized was $44.3 million and $45.0 million as of December 30, 2016, and September 30, 2016, respectively.

Obligation Under Capital Lease

The Company leases building and equipment under capital leases. The present value of the minimum capital lease payments, net of the current portion, totaled $66.0 million and $66.2 million as of December 30, 2016, and September 30, 2016, respectively.