Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Apr. 03, 2015
Senior Notes
Total senior notes long-term, net	$ 582,025	$ 582,657
Other Long-Term Debt
Other	842	822
Total other long-term debt	277,338	223,996
Total other long-term debt	277,338	223,996
Less: current portion of other long-term debt	267	260
Other long-term debt, net	277,071	223,736
Total debt	859,363	806,653
Less: current portion	267	260
Long-term debt, net	859,096	806,393
Revolving credit facility [Member]
Other Long-Term Debt
Credit Facility	165,000	210,000
Ex-Im Credit Facility [Member]
Other Long-Term Debt
Credit Facility	126,578	20,476
Unamortized discount on the Ex-Im Credit Facility	(15,082)	(7,302)
2020 Notes [Member]
Senior Notes
Principal amounts of Senior Notes issued	575,000	575,000
Unamortized premium on the 2020 Notes	7,025	7,657
Total senior notes, net of premium	582,025	582,657
Total senior notes, net of premium	582,025	582,657
Less: current portion of the senior notes	0	0
Total senior notes long-term, net	$ 582,025	$ 582,657