Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Feb. 11, 2016	May. 01, 2016	Jan. 31, 2016	Mar. 04, 2015	Jan. 25, 2015
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate				$ 70,000
Earn-out liability booked		$ 7,638	$ 6,259
Amount expected to be settled within twelve months		2,429	2,155
Cycleo [Member]
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate		16,000
Earn-out liability booked		7,638	6,259
Amount expected to be settled within twelve months		2,429	2,155
Triune Systems [Member]
Commitments and Contingencies [Line Items]
Earn-out liability booked		0	0	16,200
Amount expected to be settled within twelve months		0	$ 0
Environmental Issue
Commitments and Contingencies [Line Items]
Environmental loss contingency accrual, at carrying value		5,300
Additional Earn-out Payable After Third Fiscal Year From Acquisition Date [Member] | Triune Systems [Member]
Commitments and Contingencies [Line Items]
Potential payments under earn-out arrangements, high estimate				$ 16,000
Minimum [Member] | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss		5,300			$ 2,700
Maximum [Member] | Environmental Issue
Commitments and Contingencies [Line Items]
Loss contingency, estimate of possible loss		7,500			$ 5,700
Accrued Liabilities [Member]
Commitments and Contingencies [Line Items]
Environmental loss contingency accrual, at carrying value		900
Other liabilities [Member]
Commitments and Contingencies [Line Items]
Environmental loss contingency accrual, at carrying value		$ 4,400
Unsecured Subordinated Convertible Promissory Note [Member] | Settlement of Dispute With Competitor [Member]
Commitments and Contingencies [Line Items]
Settlement amount	$ 5,700
Cash Settlement [Member] | Settlement of Dispute With Competitor [Member]
Commitments and Contingencies [Line Items]
Settlement amount	$ 300