Segment Information - Financial Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jun. 30, 2012
Schedule Of Geographical Segments [Line Items]
Revenues	$ 229,174	$ 217,064	$ 451,602	$ 426,787
Income from operations	22,856	16,954	42,404	32,429
Total assets	902,062	860,200	902,062	860,200	873,731
Depreciation and amortization expense	8,000	8,400	16,066	17,153
United States [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	189,000	179,500	374,400	353,000
Income from operations	18,100	12,900	34,300	25,400
Total assets	830,400	796,400	830,400	796,400
Depreciation and amortization expense	6,700	7,100	13,500	14,600
Canada [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	40,200	37,600	77,200	73,800
Income from operations	4,800	4,100	8,100	7,000
Total assets	159,600	143,900	159,600	143,900
Depreciation and amortization expense	1,300	1,300	2,600	2,600
Elimination [Member]
Schedule Of Geographical Segments [Line Items]
Revenues	0	0	0	0
Income from operations	0	0	0	0
Total assets	(87,900)	(80,100)	(87,900)	(80,100)
Depreciation and amortization expense	$ 0	$ 0	$ 0	$ 0