Associate Retirement Plans - Components of Net Periodic Pension and Postretirement Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 22, 2013	Jun. 23, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	517	597
Expected return on plan assets	(944)	(1,038)
Amortization of prior service cost
Recognized actuarial net loss	300	295
Net periodic (benefit) cost	(127)	(146)
SERP Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	7	10
Expected return on plan assets
Amortization of prior service cost
Recognized actuarial net loss	7	7
Net periodic (benefit) cost	14	17
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	60	45
Interest cost	87	93
Expected return on plan assets
Amortization of prior service cost	(12)	(13)
Recognized actuarial net loss	41	32
Net periodic (benefit) cost	$ 176	$ 157