Note 12 Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2018

Share-based Compensation [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	Three Months Ended				Six Months Ended
	March 31, 2018		April 1, 2017		March 31, 2018		April 1, 2017
	(In thousands)
Stock options	$	2,566	$	380	$	3,743	$	930
Restricted stock units, including performance based awards	7,729		7,262		15,194		18,689
Total	$	10,295	$	7,642	$	18,937	$	19,619

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended				Six Months Ended
	March 31, 2018		April 1, 2017		March 31, 2018		April 1, 2017
	(In thousands)
Cost of sales	$	1,851	$	2,035	$	4,299	$	4,899
Selling, general and administrative	8,388		5,376		14,552		14,216
Research and development	56		231		86		504
Total	$	10,295	$	7,642	$	18,937	$	19,619

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of Shares		Weighted- Average Exercise Price ($)	Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value of In-The-Money Options ($)
	(In thousands)				(In thousands)
Outstanding as of September 30, 2017	3,568		11.83	3.82	90,327
Granted	200		38.45
Exercised/Cancelled/Forfeited/Expired	(337	)	11.41
Outstanding as of March 31, 2018	3,431		13.42	3.86	53,074
Vested and expected to vest as of March 31, 2018	3,429		13.42	3.86	53,059
Exercisable as of March 31, 2018	3,234		12.11	3.55	52,867

Schedule of Restricted Stock Units Award Activity [Table Text Block]

	Number of Shares		Weighted- Average Grant Date Fair Value ($)	Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($)
	(In thousands)				(In thousands)
Outstanding as of September 30, 2017	3,359		27.56	1.51	124,800
Granted	793		34.85
Vested/Forfeited/Cancelled	(792	)	26.30
Outstanding as of March 31, 2018	3,360		29.58	1.44	95,080
Expected to vest as of March 31, 2018	2,574		28.72	1.40	72,842