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Share-Based Compensation Plans - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 03, 2020 shares	Oct. 02, 2020 USD ($) plan employee tranche $ / shares shares	Sep. 27, 2019 USD ($) $ / shares shares	Sep. 28, 2018 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)		17,000,000.0
Compensation and benefits \| $		$ 32,254	$ 20,455
Total fair value of restricted stock awards and units vesting \| $		7,900
Share-based compensation expense \| $		$ 35,674	$ 23,792	$ 31,937
Common stock, issued (in shares)		66,921,000	66,177,000
Unrecognized compensation costs \| $		$ 45,300
Weighted average period for recognition of unrecognized compensation costs		2 years 1 month 6 days
Intrinsic value of options recognized \| $		$ 1,400	$ 700	$ 900
Options granted (in shares)		0
Unamortized compensation on share-based compensation modification \| $		$ 1,700
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Other		147,929
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)		3,600,000
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)		225,523	195,598
Compensation and benefits \| $		$ 7,600	$ 2,000
Employee-related Liabilities \| $		$ 4,600
ISU awards exercised (in shares)		62,344	69,035	68,813,000
Total fair value of restricted stock awards and units vesting \| $		$ 1,900	$ 1,200	$ 1,400
Share-based compensation expense \| $		$ 4,400	$ 1,300	$ 1,100
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
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			51.90%	45.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			2.80%	2.30%
Expected term (years)			3 years 10 months 24 days	3 years 4 months 24 days
Stock Options with Performance-based Vesting Criteria
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		0	585,000	325,000
Options, aggregate grant date fair value \| $			$ 2,400	$ 5,000
Cancelled options (in shares)		1,122,500
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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)		168,481
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
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 \| $		$ 19,100	$ 11,700	$ 19,700
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		648,000
Granted (in shares)		1,210,000
Forfeited, canceled or expired (in shares)		389,000
Granted (in USD per share) \| $ / shares		$ 22.07
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%
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)		132,668
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase of share available for future issuance (in shares)		550,000
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)		272,469	421,777	305,851
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
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
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 \| 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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		443,787
Maximum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 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		1,388,898
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%