LANSING, Mich. — The Michigan Legislature narrowly approved a $617 million bailout and restructuring of Detroit’s debt-ridden school district early Thursday, two years after the state spent less than a third of that amount to help the city government emerge from bankruptcy.

The legislation goes to Gov. Rick Snyder for his expected signature. The Republican-controlled Senate passed a main bill 19-18 late Wednesday, and the GOP-led House followed with a similar razor-thin 55-54 vote. Some Republicans joined all Democrats in opposition during an emotional debate that brought some lawmakers to tears.

Snyder, who had warned legislators that insolvency would be disastrous for students and the state if the district ran short of money this summer — as it would have without further intervention — said in a statement that the measure is a “fresh start” and an “unprecedented investment for the education of Detroit’s children.”

The financially and academically ailing 46,000-student Detroit Public Schools has been managed by the state for seven years, during which it has continued to face plummeting enrollment, deficits and, more recently, teacher sick-out protests.

Under the bills, the district would be split in two and control would be returned to an elected school board. A commission of state appointees would oversee the district’s finances, similar to how it now reviews the city’s budgeting as part of a $195 million state rescue in 2014.

The new debt-free district would educate students. The old district would stay intact for tax-collection purposes to retire $617 million in debt over 8½ years, including $150 million in transition costs to launch the new Detroit Community Schools.

Furious Democrats accused “coward” Republicans of bowing to the politically influential school-choice lobby in dropping a proposed commission of mayoral appointees to regulate the opening of new schools — including independent, publicly funded charters that have drawn students and funding away from traditional neighborhood schools.

Sen. Bert Johnson, a Highland Park Democrat who represents part of Detroit, said the legislation is “paternalistic” and “unethical.”

“If you do this, you are systematically spelling the end of the Detroit Public Schools system,” he said. “Parents are already concerned. … I think it’s going to drive enrollment further into the ground.”