Acquisition Activity - Narrative (Detail) $ in Millions				3 Months Ended		24 Months Ended
	Jul. 01, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jul. 01, 2016 USD ($) employee	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($) Office	Jul. 01, 2018 USD ($)
Capital Unit [Line Items]
Purchase price as percentage of loans outstanding					98.70%
Commercial loans acquired					$ 182.3
Portion of commercial loans drawn at date of acquisition					$ 155.1
Number of commercial lending offices assumed | Office					2
New England Commercial Lending Acquisition
Capital Unit [Line Items]
Adjustable-rate jumbo mortgage loans purchased				$ 277.9
Purchase price as percentage of loans outstanding				100.75%
Scenario, Forecast | Higher One, Inc's Disbursements Business
Capital Unit [Line Items]
Number of employees hired | employee			225
Payments made to Higher One, Inc.	$ 10.0	$ 10.0	$ 17.0			$ 42.0
Payments under transition services agreement			$ 5.0