Commitments and Contingencies - Annual Required Payments (Details) - USD ($)	1 Months Ended		2 Months Ended	12 Months Ended
	Sep. 29, 2016	Aug. 31, 2016	Sep. 29, 2016	Jul. 31, 2016	Jul. 31, 2014	Aug. 01, 2016
Minimum commitments under noncancelable operating leases
2017				$ 6,139,000
2018				5,241,000
2019				4,211,000
2020				2,989,000
2021				2,180,000
Thereafter				3,408,000
Total				24,168,000
Total contractual obligations
2017				19,640,000
2018				10,785,000
2019				122,631,000
2020				3,745,000
2021				2,840,000
Thereafter				4,430,000
Total				164,071,000
Repayment of borrowings					$ 5,000,000
Jet Prep Ltd.
Total contractual obligations
Assumed contingent obligation				1,138,000
Compensation agreements
Other commitments
2017				10,470,000
2018				2,519,000
2019				498,000
2020				498,000
2021				377,000
Thereafter				583,000
Total				14,945,000
Compensation agreements | Former CEO retirement obligation
Other commitments
2017				3,823,000
Total				4,500,000
Compensation agreements | Accutron, Inc. | Subsequent Events
Total contractual obligations
Increase in other commitment due in next twelve months						$ 400,000
Increase in other commitment due in second year						$ 400,000
Assumed contingent liability
Other commitments
2017				19,000
2018				93,000
2019				188,000
2020				246,000
2021				280,000
Thereafter				439,000
Total				$ 1,265,000
Assumed contingent liability | Jet Prep Ltd.
Total contractual obligations
Discount rate of potential payments (as a percent)				2.50%
Assumed contingent obligation				$ 1,138,000
Contingent guaranteed obligation
Other commitments
2017				186,000
2018				133,000
2019				122,000
Total				441,000
Other long-term obligations
Other commitments
2017				228,000
2018				200,000
2019				96,000
2020				12,000
2021				3,000
Total				539,000
Credit Agreement
Maturity of the credit facility
2019				116,000,000
Total				116,000,000
Expected interest payments under the credit facility
2017				2,598,000
2018				2,599,000
2019				1,516,000
Total				$ 6,713,000
Total contractual obligations
Weighted average interest rate on outstanding borrowings (as a percent)				2.24%
Credit Agreement | Subsequent Events
Maturity of the credit facility
Total	$ 171,000,000		$ 171,000,000
Total contractual obligations
Repayment of borrowings			6,000,000
Increase in expected interest payments	1,232,000		1,232,000
Revolving Credit Facility | Subsequent Events
Total contractual obligations
Amount borrowed	$ 6,000,000	$ 55,000,000	$ 61,000,000