Postretirement Benefit Plans (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 25, 2016 USD ($)	Mar. 25, 2017 USD ($)	Mar. 26, 2016 USD ($)	Mar. 28, 2015 USD ($)
Accrued salaries and benefits		$ 40,190	$ 21,239
Number of Pension Plan Participants Offered ETV		49
Number of Pension Plan Participants Accepting ETV		9
Pension Contributions	$ 500	$ 500
ETV pension expense		$ 400
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.70%	3.60%	3.20%
Maximum employer contribution matching percentage		50.00%
Percentage of employees' annual contribution that qualifies for employer contribution matching		8.00%
Employee matching contribution expense		$ 5,500	$ 4,300	$ 2,500
Pension Plan [Member]
Accrued salaries and benefits			$ 500