Long-term Debt (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended
	Apr. 04, 2016	Oct. 01, 2015	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Debt financing costs				$ 0	$ 2,359
Balance of unamortized debt issuance costs				$ 4,638		$ 5,521
2008 Note Purchase Agreement [Member]
Issuance Date				Oct. 01, 2008
Series C Notes [Member]
Principal Payment Amount		$ 50,000
2009 Note Purchase Agreement [Member]
Issuance Date				Apr. 01, 2009
Series E Notes [Member]
Principal Payment Amount	$ 57,000
2013 Note Purchase Agreement [Member]
Issuance Date				Oct. 01, 2013
Face Amount				$ 250,000
Series J Notes [Member]
Variable interest rate				1.88%
First Closing Notes [Member]
Issuance Date				Oct. 01, 2013
Second Closing Notes [Member]
Issuance Date			Nov. 15, 2013	Nov. 15, 2013
Other Foreign Short-term Borrowings [Member]
Outstanding borrowings				$ 0
Chinese Credit Facility [Member]
Line of Credit Facility, Expiration Date				Sep. 01, 2016
Line of Credit Facility, Maximum Borrowing Capacity				$ 22,700			$ 22,700
Outstanding borrowings				$ 0
Chinese Credit Facility, RMB Denominated Loan [Member]
Variable Rate Basis				interest at the prevailing interest rate offered by the People's Bank of China on the date of borrowing, plus a margin equal to 15% of that prevailing rate
Chinese Credit Facility, USD Denominated Loan [Member]
Variable Rate Basis				interest at the lender's cost of borrowing rate at the date of borrowing, plus 3%
Revolving Credit Agreement [Member]
Variable Rate Basis				LIBOR
Line of Credit Facility, Expiration Date				Apr. 01, 2020
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000,000
Outstanding borrowings				$ 392,000		$ 350,000
Credit facility effective interest rate on outstanding borrowing				1.51%		1.44%
Revolving Credit Agreement [Member] | Minimum [Member]
Basis Spread On Variable Rate				0.85%
Revolving Credit Agreement [Member] | Maximum [Member]
Basis Spread On Variable Rate				1.65%