Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 26, 2015	Sep. 28, 2013	Sep. 27, 2014
Income Taxes [Line Items]
Deferred tax assets, release of valuation allowance		$ 19,900,000
Increase in valuation allowance	$ 1,900,000
Gross unrecognized tax benefits, excluding interest			$ 137,000,000
Unrecognized tax benefit that would impact effective tax rate	74,900,000
Interest accrued on unrecognized tax benefits	9,900,000		$ 8,300,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0
Unremitted foreign earnings	60,900,000
Net Operating Losses Carryforwards [Member]
Income Taxes [Line Items]
Amount with unlimited carry forward periods	54,900,000
Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Amount with unlimited carry forward periods	9,000,000
Federal net operating loss expected to be expired unutilized	4,500,000
State net operating loss expected to be expired unutilized	180,500,000
Foreign net operating loss expected to be expired unutilized	49,000,000
Minimum [Member]
Income Taxes [Line Items]
Amount of unrecognized tax benefits that are reasonably possible of being reduced in the next twelve months	2,000,000
Maximum [Member]
Income Taxes [Line Items]
Amount of unrecognized tax benefits that are reasonably possible of being reduced in the next twelve months	4,000,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Federal net operating losses	17,300,000
Federal credit carry forwards	4,700,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Federal net operating losses	91,500,000
Federal credit carry forwards	13,000,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Federal net operating losses	56,600,000
Federal credit carry forwards	$ 1,500,000