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Share-Based Compensation Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2017 USD ($) $ / shares shares	Jun. 28, 2019 shares	Sep. 27, 2019 USD ($) tranche plan employee $ / shares shares	Sep. 28, 2018 USD ($) $ / shares shares	Sep. 29, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans \| plan			3
Number of shares available for future issuance (in shares)			15,700,000
Compensation and benefits \| $			$ 20,455	$ 22,935
Share-based compensation expense \| $			$ (23,792)	$ (31,937)	$ (36,335)
Common stock, issued (in shares)			66,177,000	65,202,000
Unrecognized compensation costs \| $			$ 47,000
Weighted average period for recognition of unrecognized compensation costs			2 years 10 months 24 days
Intrinsic value of options recognized \| $			$ 700	$ 900	8,900
Options granted (in shares)			585,000
Expected term (years)			3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)			3,400,000
Unrecognized compensation expense \| $			$ 300
Incentive Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
ISU awards outstanding (in shares)			195,598	191,620
Compensation and benefits \| $			$ 2,000	$ 1,900
ISU awards exercised (in shares)			69,035
Total fair value of restricted stock awards and units vesting \| $			$ 1,200
Share-based compensation expense \| $			$ 1,300	$ 1,100	$ (3,900)
Stock Options with Performance-based Vesting Criteria
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)			585,000	325,000	320,000
Options, aggregate grant date fair value \| $			$ 2,400	$ 5,000	$ 4,300
Cancelled options (in shares)			1,122,500
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $			$ 2,800
Granted (in shares)			748,328
Number of employees affected \| employee			13
Plan modification incremental compensation cost \| $			$ 8,200
Award requisite service period			3 years
Forfeited, canceled or expired (in shares)			745,047
Stock Options with Market-based Vesting Criteria
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term			7 years
Weighted average period for recognition of unrecognized compensation costs			3 years
Grant date fair value of options (in USD per share) \| $ / shares			$ 7.47	$ 15.52	$ 13.18
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			51.90%	45.80%	32.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			2.80%	2.30%	1.90%
Expected term (years)			3 years 10 months 24 days	3 years 4 months 24 days	7 years
Non Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period for target price per share for recognition of remaining unamortized compensation cost			30 days
Options granted (in shares)	69,076
Incentive And Nonqualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for recognition of unrecognized compensation costs	4 years 6 months
Grant date fair value of options (in USD per share) \| $ / shares	$ 17.55
Options, aggregate grant date fair value \| $	$ 1,400
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	45.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.21%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price \| $ / shares	$ 36.61
Expected term (years)	6 years 6 months
Restricted Stock Awards and Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of restricted stock awards and units vesting \| $			$ 11,700	$ 19,700	$ 51,200
Granted (in shares)			2,977,000
Forfeited, canceled or expired (in shares)			1,563,000
Granted (in USD per share) \| $ / shares			$ 18.18
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			61.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			1.90%
Aggregate intrinsic value of vesting restricted stock units \| $			$ 56,300
Expected term (years)			3 years 3 months 29 days
PRSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of tranches \| tranche			3
Granted (in shares)			1,005,854
Employee Stock \| Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum ESPP payroll deductions			15.00%
Common stock, issued (in shares)			421,777	305,851	146,149
Maximum percentage annual increase of share available for future issuance			1.25%
Annual increase of share available for future issuance (in shares)			550,000
Employee Stock \| 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase of share available for future issuance (in shares)			1,900,000
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	10,924
Employee Stock Option \| 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage annual increase of share available for future issuance			4.00%
Market Based Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		200,000
Granted (in USD per share) \| $ / shares			$ 17.65
Aggregate grant date fair value \| $			$ 3,500
Allocated compensation expense \| $			$ 3,500
Compute Business
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $				$ (800)
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term			4 years
Minimum \| PRSU awards \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			0.00%
Minimum \| PRSU awards \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			0.00%
Minimum \| PRSU awards \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			0.00%
Minimum \| Market Based Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term			7 years
Maximum \| PRSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			300.00%
Incremental PRSU that could vest if all performance criteria are achieved			1,196,337
Maximum \| PRSU awards \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			300.00%
Maximum \| PRSU awards \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			300.00%
Maximum \| Market Based Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Earnings percentage of targeted shares			150.00%