CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Apr. 25, 2015	Jul. 26, 2014
Statement of Financial Position [Abstract]
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021)	$ 2.9	$ 3.2
Preferred stock, par value (in dollars per share)	$ 1	$ 1.00
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.333	$ 0.333
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	34,076,566	33,990,589
Common stock, outstanding (in shares)	34,076,566	33,990,589