Components of Intangible Assets (Parenthetical) (Detail)	3 Months Ended	12 Months Ended
	Jan. 31, 2014	Oct. 01, 2013
Non-compete agreements (estimated life 5 years)
Intangible Assets [Line Items]
Amortizable intangible assets, estimated life	5 years	5 years
Customer relationships (estimated life 9.6 years)
Intangible Assets [Line Items]
Amortizable intangible assets, estimated life	9 years 7 months 6 days	9 years 7 months 6 days