Derivative Financial Instruments (Details) $ in Thousands, CAD in Millions	3 Months Ended					12 Months Ended
	Mar. 31, 2013 USD ($) item	Jul. 03, 2011 CAD	Jul. 03, 2011 USD ($)	Apr. 04, 2010 CAD	Apr. 04, 2010 USD ($)	Sep. 27, 2015 USD ($) item	Sep. 28, 2014 USD ($) item	Sep. 29, 2013 item
Not designated as hedging instruments
Derivative financial instruments
Number of derivative instruments | item						0	0	0
Foreign currency forward contracts and interest rate swap agreements | Derivatives designated as hedging instruments
Derivative financial instruments
Amounts excluded from effectiveness testing						$ 0
Foreign currency forward contracts
Derivative financial instruments
Notional amount of foreign currency forward contracts		CAD 4.2	$ 4,200	CAD 4.2	$ 3,900
Number of foreign currency forward contracts settled | item	1
Settlement amount of the foreign currency forward contract	$ 3,900
Interest rate swap agreements | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Number of derivative agreements | item							2	3
Amount of effective portion of derivatives before tax effect						2,300	$ (200)
Amount expected to be reclassified from accumulated other comprehensive income to interest expense						$ 2,300	$ (200)
Period of reclassification from accumulated other comprehensive income to interest expense						12 months
Interest rate swap agreement bearing fixed rate 1.36% | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Notional Amount						$ 48,047
Fixed Rate (as a percent)						1.36%
Interest rate swap agreement bearing fixed rate 1.34% | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Notional Amount						$ 48,047
Fixed Rate (as a percent)						1.34%
Interest rate swap agreement bearing fixed rate 1.35% | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Notional Amount						$ 48,047
Fixed Rate (as a percent)						1.35%
Interest rate swap agreement bearing fixed rate 1.23% | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Notional Amount						$ 24,023
Fixed Rate (as a percent)						1.23%
Interest rate swap agreement bearing fixed rate 1.24% | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative financial instruments
Notional Amount						$ 24,023
Fixed Rate (as a percent)						1.24%